Question

When Kadijah and Cal read the same foldable, they realized how interesting folktales can be. Is it a...

Answer 1

This is a complex sentence it includes a subordinate clause (one that CANNOT stand by itself), and a dependent clause.  You can tell this because if I were to walk into a room and say, "When K and C read the same foldable....", you would be waiting to hear the rest, wouldn't you?  A compound sentence has two independent clauses joined by a comma and a coordinating conjunction (but, and, for, nor, or, so, yet).  A simple sentence is just an independent clause.