Answer:
A compound-complex sentence is comprised of at least two independent(main) clauses and one or more dependent(subordinate) clauses.
Step-by-step explanation:
Compound Complex Sentence: a sentence having two or more coordinate independent clauses and one or more dependent clauses
Example: Though Mitchell prefers watching romantic films, he rented the latest spy thriller, and he enjoyed it very much.
Example: Laura forgot her friend's birthday, so she sent her a card when she finally remembered.
Because compound-complex sentences are normally longer than other sentences, it is very important to punctuate them correctly