Question

althrough he was smart, she didn't understand the problem.(complex, simple sentence).​

Answer 1

It is a complex sentence

Answer 2

Answer:

A Complex Sentence. A complex sentence has an independent clause and at least one dependent clause. For example: The human brain never stops working until you stand up to speak in public.

Complex sentences are sentences that have two clauses. There can be two independent clauses (each having a subject and predicate), or an independent clause and dependent clause (missing a subject or predicate).