Answer: A sentence with two or more main clauses and one or more subordinate clauses is a compound-complex sentence.
Step-by-step explanation: A compound-complex sentence is a long sentence that joins two types of sentence: compound sentences and complex sentences. In that way, a compound-complex sentence includes two or more independent clauses and one or more dependent clauses. Independent clauses, which can stand alone as complete sentences, are joined by means of a coordinating conjunction, while dependent clauses, which do not express full ideas, are introduced by a subordinating conjunction. One example of compound-complex sentence is "Although we left the house early, we could not arrive to the concert in time, and we had to return home".