I recently read something that led me to ask all of you the following question:

Do you consider "if" and "because" to be coordinating or subordinating conjunctions?  For example, consider the following two sentences:

He wanted to know if it rained.
and
He was late because he forgot.

Are they compound (two main clauses), or are they complex (a main clause and a subordinate clause)?

I will appreciate your answers very much.
Thanks,
Ed V.