Wiktionary
compound sentence
n. (context grammar English) a sentence that has two or more independent clauses, joined by a conjunction (such as 'but', 'and') and/or punctuation (such as ',').
WordNet
compound sentence
n. a sentence composed of at least two coordinate independent clauses
Usage examples of "compound sentence".
It was rare that he could complete a compound sentence, or after a particularly stupefying weekend, a simple one.