Hey!
A simple sentence is a sentence that is made up of 1 independent clause.
Example: I am a human.
A complex sentence is made up of 1 independent clause AND 1 or more subordinate clauses.
Example: Because I did my homework, I had an A in the class.
A compound-complex sentence is made up of 2 or more independent clauses and 1 or more subordinate clauses.
Example: Although I like reading books, I haven't read any this summer, and I don't think I have time to.
A compound sentence is made up of 2 independent clauses.
Example: I like reading books, and I also like taking pictures.
<em>I hope you find this useful :)</em>
I believe the correct answer is C) Teiresias' prophecies have proved true in the past, and that is the reason why Creon decided at last that his decree about Polyneices' burial is against the god's will.