In the section on the question How to distinguish a complex sentence from a complex sentence asked by the author Angela Ustinova the best answer is I'll try in my own words)

Complex sentence - consists of simple sentences that are interconnected by coordinating conjunctions and, as a rule, are equal grammatically and in meaning.
Coordinating conjunctions - And, yes (meaning “and”), and... and, neither... nor, too, also, But, a, yes (meaning “but”), however, but, same, Or, either, whether... either, then... this, not that... either... or... or How... and not only... but and, although... but if not... then, not so much... how much, Namely, that is, or (in the meaning of “that is”), somehow, And then, and then, yes and, and also, etc.

A complex sentence is a complex sentence in which one simple sentence is subordinate to another, connected by a subordinating conjunction or a conjunctive word.
Subordinating conjunctions - What, so that, as, etc., When, as soon as, only only, barely, only, only, before, since, until, not yet, after, as long as, as long as as, after, because, since, for, due to the fact that, due to the fact that, in view of the fact that, because, in connection with the fact that, due to the fact that, due to the fact that, due to the fact that , If, if, once, if, if, As, as if, as if, as if, exactly, than, rather than, just as, as if.

In general, in a complex compound there are two equal parts, and in a complex compound one depends on the other) VOILA)

Answer from Helena[active]
Simple sentences in a complex they are connected using conjunctions like, as if, because. In a compound compound using conjunctions that, and.

Answer from Tessa[guru]
In complex sentences, one simple clause (subordinate clause) depends on another (main clause). From the main clause to the subordinate clause you can ask a question. For example:
We watched with keen interest (what were we watching?) as they practiced playing hockey. In addition, the subordinate clause (as they practiced in the game of hockey) cannot exist on its own.

In a complex sentence, the component parts are grammatically independent of each other, that is, they are equal, which means each of the parts is main and can exist independently. For example:
It’s still very early, but the miners are already heading to their morning shift. That is, from this sentence you can easily make 2 independent sentences.
1. It's still very early.
2. The miners are already heading to their morning shift.
I hope I explained it clearly.

In the section on the question How to quickly and easily determine whether a sentence is compound or complex? given by the author Marina the best answer is By alliance:
If the conjunctions are “a, but, and, or, yes (in the meaning of and)”, etc., this is a composition.
And if the conjunctions are “Which, because”, etc. AND you can also ask questions from the dependent clause to the main clause, then this is a subordinate clause
It started to rain and a thunderstorm began - composed
It started to rain, because of which a thunderstorm started - subordinate (Why did the thunderstorm start? Because it started to rain

Answer from Drizzle[newbie]
In a complex sentence, the parts are equal in meaning, which means that by removing the conjunction, we can make them simple sentences without distorting the meaning.

Answer from chevron[guru]
In a complex sentence, the parts are equal in meaning, which means that by removing the conjunction, we can make them simple sentences without distorting the meaning. In a complex sentence, the parts depend on one another. And if one of them can be an independent proposal, then the other - never! In addition, you need to know that in complex sentences, coordinating conjunctions are used to connect parts, and in complex sentences, subordinating conjunctions are used, respectively.

Answer from Sedge[guru]
very simple, based on conjunctions:
in compounds - and, a, but
in complex subordinates - what, when, if, which, etc.
possible on questions, in complex ones one depends on the other

Answer from Marylave[newbie]
Compound - when two parts of a sentence are not related to each other. Complex - when there is some kind of connection between them, and usually they are united by some kind of union: which, because, etc.

Answer from Arini-k[guru]
According to the conjunctions and allied words used.
Check whether you can ask a question from one simple sentence to another. If yes, then complex

Answer from Lyudmila[guru]
Look at the means of communication! In SSP there are coordinating conjunctions, and in SPP there are subordinating conjunctions and allied words.

Answer from Fucking Man[active]
Yyyyy

How to quickly and easily determine whether a sentence is compound or complex?

• very simple, based on conjunctions:
  in compounds - and, a, but
  in complex subordinates - what, when, if, which, etc.
  possible on questions, in complex ones one depends on the other
• By alliance:
  If the conjunctions are “a, but, and, or, yes (in the meaning of and)”, etc., it is composed.
  And if the conjunctions are “Which, because”, etc. AND you can also ask questions from the dependent clause to the main clause, then this is a subordinate clause

  It started to rain and a thunderstorm began - composed
  It started to rain, because of which a thunderstorm started - subordinate (Why did the thunderstorm start? Because it started to rain

• In a complex sentence, the parts are equal in meaning, which means that by removing the conjunction, we can make them simple sentences without distorting the meaning. In a complex sentence, the parts depend on one another. And if one of them can be an independent proposal, then the other - never! In addition, you need to know that in complex sentences, coordinating conjunctions are used to connect parts, and in complex sentences, subordinating conjunctions are used, respectively.
• Compound - when two parts of a sentence are not related to each other. Complex - when there is some kind of connection between them, and usually they are united by some kind of union: which, because, etc.
• Look at the means of communication! In SSP there are coordinating conjunctions, and in SPP there are subordinating conjunctions and allied words.
• According to the conjunctions and allied words used.
  Check whether you can ask a question from one simple sentence to another. If yes, then complex

Instructions

Try to identify the connection between two simple sentences that are part of a complex one. Determine whether one of them depends on the other. In complex sentences, you can always ask a question from the main clause to the subordinate clause, for example, “He said (what did he say?) that he would go home.”

To check, put a period between the sentences. If a complex structure painlessly falls apart into two parts, and they “feel” perfectly separate from each other, this is a compound offer. For example, compare: “We were walking in the park, and Bobik was running around” and “We were walking in the park. Bobik was running around."

If, when dividing a sentence into two parts, one of them loses or changes its meaning, feel free to conclude that this is a complex offer. For example, a period between the sentences “Grandma asked me to buy medicine” will distort the meaning.

Find a conjunction between sentences; in many cases, it is from this that you can understand what offer in front of you. The conjunctions a, and, but, yes are found in complex sentences, and the conjunctions because, when, so that, where, that, since, if, so, whose, where, etc. - in complex subordinates. If there is no union at all, this is a complex non-union offer.

To distinguish complex offer from simple, swipe parsing. Find all the subjects and predicates - if a sentence has two bases connected by subordination and one of the complex conjunctions, then you have a complex subordination offer. Sometimes the stem of one of the constituent sentences consists of only a predicate or only a subject, for example, “It’s late, so let’s go home.”

Be careful, sometimes the main thing is offer can be torn into two parts, for example: “A scream was heard from the street, which was filled with people.”

Sources:

• how to determine whether a sentence is simple or

Video on the topic

Sources:

• Complex sentence in 2018

Tip 3: How to distinguish a complex sentence from a complex sentence

Complex offer- This offer consisting of several simple ones. There are two main types complex sentences: complex and complex. They can be distinguished from each other by several characteristics.

Instructions

Pay attention to the way the sentences are connected. Simple sentences as part of a complex sentence are connected intonationally or using subordinating and allied words (relatives). For example: what, so that, when, if, because, since, which, where, while and others. In a complex sentence, communication is made through intonation and coordinating conjunctions. These include: and, and, but, or, either, as...so and, but, and others.

Difficult to subordinate called offer, parts of which are grammatically unequal and are connected by subordinating conjunctions or allied words.

Part complex sentence , subordinating the subordinate clause is called main sentence . A part of a complex sentence that is syntactically dependent on another is called subordinate clause . The main and subordinate clauses are interconnected: they are united by meaning and construction.

Complex sentences include the main thing and one or more subordinate clauses. Subordinate clauses are subordinate to the main clause and answer the questions of the members of the sentence.

The subordinate clause can appear after the main clause, in the middle of it, or before it.

For example: You should only read those books who teach to understand the meaning of life, the desires of people and the motives of their actions. (M. Gorky.) The branches of the trees seemed shaggy and, when the breeze came, made a slight noise with the first green noise. (G. Skrebnitsky.) If the language weren't more poetic n, there would be no art of words - poetry. (S. Marshak.)

The place of the subordinate clause in relation to the main clause can be depicted graphically:

[=], (which =).

[-= and, (when --), =].

(If - =), [=]

Subordinate clauses are separated from the main clause by commas. If the subordinate clause is in the middle of the main clause, it is separated by commas on both sides.

If there are several subordinate clauses in a complex sentence, then they can explain not only the main clause, but also each other.

For example: 1) When in my hands A new book , I feel, that something living, speaking, wonderful had entered my life.(M. Gorky.) 2) Painting is also important because that the artist often notices what we do not see at all.(K. Paustovsky.)

In the first complex sentence, the main clause is explained by two subordinate clauses. In the second complex sentence, the main clause is Painting is also important because; first clause - what the artist often notices is - explains the main thing, and itself is explained by the second subordinate clause - what we don't see at all .

Subordinating conjunctions and allied words in complex sentences

Subordinate clauses are attached to the main clause (or to another subordinate clause) by subordinating conjunctions (simple and compound) or allied words (relative pronouns), which are presented in the table:

Subordinating conjunctions are not members of the subordinate clause, but serve only to attach subordinate clauses to the main or other subordinate clause.

For example: It is bitter to think that life will pass without grief and without happiness, in the bustle of daily worries.(I. Bunin.)

Conjunctive words not only attach subordinate clauses to the main clause (or other subordinate clause), but are also members of subordinate clauses.

For example: In autumn, birds fly to places where it is always warm. I don't know why he did it.

In these sentences the connecting words Where And For what are circumstances.

The conjunction word requires special comment which. It can act as different members of a sentence: subject, predicate, inconsistent definition, adverbial and complement. To determine the syntactic function of a conjunctive word which, you need to find out which word of the main sentence it replaces, substitute it in place of the allied word and determine which member of the subordinate clause it is.

For example: Village, which located on the river bank, very beautiful. IN this proposal a conjunctive word that refers to the noun village. If you substitute the word village in a subordinate clause, you get: Village located on the shore. In this sentence the word village performs the function of the subject, therefore, in the subordinate part of the original sentence there is a conjunctive word which is also subject.

Compare: The lake we approached turned out to be clean and deep. “I met a man whom I had not seen for a long time.

Some of the allied words turn out to be homonymous to unions, that is, in some cases they act as unions, and in others - as allied words.

To distinguish a conjunction from an allied word, you must remember:

1) in some cases the conjunction can be omitted, but the conjunction word cannot:

For example: Tanya says that the grass grows at night. (V. Belov.) - Tanya says: “The grass grows at night”;

2) a union can only be replaced by another union.

For example: When (if) work is pleasure, life is good.(M. Gorky.)

3) A conjunctive word can only be replaced by a conjunctive word or those words from the main sentence to which the subordinate clause relates,

For example: Remember the songs that the nightingale sang.(I. Bunin.)

Word What is a conjunctive word, since it cannot be omitted, but can be replaced with a conjunctive word which ( Remember the songs that the nightingale sang) and the words of the song ( Remember the songs: the nightingale sang these songs).

The ability to distinguish between conjunctions and allied words is necessary for the correct intonation of a sentence, since often allied words are the semantic center, they are highlighted by logical stress.

What how And When can be both conjunctions and allied words

To distinguish these allied words and conjunctions, you should remember that:

1) for allied words What And How logical stress usually falls;

2) you can ask a semantic question about them and determine which member of the sentence they are;

3) they cannot be removed from the sentence without violating the meaning, but they can be replaced with synonymous allied words.

Compare: I knew our house needed renovation. - I knew: our house needed repairs.

House, What standing opposite, in need of renovation. - The house opposite is in need of renovation.

When distinguishing between a union word and a conjunction When you should rely on the meaning of the subordinate parts. In subordinate clauses and often in subordinate clauses When is a conjunctive word, in all other cases When- union:

For example: I remember well the day we met. Nobody knew when he appeared in our city. When the snowstorm ends, you can go for a walk.

The role of demonstrative words in the subordination of sentences

Indicative words can sometimes be used in the main part of a complex sentence that, such, all, everyone, no one, there, then and etc.

The role of demonstrative words in the organization of complex sentences is not the same.

Firstly , they may be constructively necessary (a sentence with a given subordinate clause cannot be constructed without them).

For example: I'm the one no one loves. The inclusion of correlative words necessary for the structure of the sentence is mandatory for block diagram such SPP:

Secondly , correlative words can be optional, their role in the sentence in this case is intensifying and emphatic (correlative words can be omitted without loss of meaning):

He remembered that man which I was visiting Petrov.

Demonstrative words are members of the main sentence.

Features of joining subordinate clauses to the main one

The subordinate clause is attached by conjunctions and allied words to the entire main sentence, but the meaning of the subordinate clause explains:

- one word (one member of the main sentence);

For example: The village where Evgeniy was bored was a charming place. (A. Pushkin.) I guessed a long time ago that we are kindred at heart. (A. Fet.) Having loaded the rifle, Andrei again rose above the pile of stones, wondering where to shoot. (M. Bubennov.);

- phrase;

For example: She was standing there fabulous silence, which comes with frost. (P. Pavlenko.) And for a long time I'll be so kind as to I to the people that I awakened good feelings with my lyre... (A. Pushkin.) These snows glowed with a ruddy shine so fun, so bright, that, it seems, he would have stayed here forever. (M. Lermontov.);

- all the main proposal: The house stood on a slope, so the windows to the garden were very low to the ground. (S. Aksakov.) The darker the night became, the brighter the sky grew. (K. Paustovsky.)