what is a compound complex sentence

A compound-complex sentence is a sentence that consists of at least two independent clauses and one or more dependent clauses. It is a combination of a compound sentence, which has two or more independent clauses, and a complex sentence, which has one independent clause and at least one dependent clause. Compound-complex sentences allow for the expression of more complex relationships between ideas. They are typically the longest type of sentence and can add a layer of complexity to writing