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Compound sentences are one of the four main sentence structures. They are made up of at least two independent clauses expressing closely related ideas of equal or similar importance that are joined using a conjunction and/or punctuation. By using compound sentences, we can add variety to our writing and speech and avoid the repetitive sound of multiple simple sentences.
A sentence of two or more coordinate independent clauses, often joined by a conjunction or conjunctions, as The problem was difficult, but I finally found the answer.
(Grammar) a sentence containing at least two coordinate clauses
a sentence containing two or more coordinate independent clauses, usu. joined by one or more conjunctions, but no dependent clause, as The lightning flashed (independent clause) and (conjunction) the rain fell (independent clause).