Identify the choice that best describes the sentence

Even before telescopes were invented, humans were interested in astronomy.

simple

compound

complex

compound complex

complex

Explanation:

This is a compound sentence because it contains an independent clause and a dependent clause. An independent clause is able to stand on its own and would make sense as a separate sentence. A dependent clause is awkward if left alone and, as such, needs to be included as part of a sentence.

The independent clase in this example is:

humans were interested in astronomy

The dependent clause is:

even before telescopes were invented