Question

Listen carefully and take notes is compound or complex​

Answer 1

Yes, that is exactly what you should tell them. If two clauses are connected with a coordinating conjunction, it's a compound sentence. If two clauses are connected with a subordinating conjunction, it's a complex sentence.

Answer 2

A simple sentence consists of only one clause. A compound sentence consists of two or more independent clauses. A complex sentence has at least one independent clause plus at least one dependent clause. A set of words with no independent clause may be an incomplete sentence, also called a sentence fragment.