The three sentences are simple sentences on their own. Some examples of compound, complex and compound-complex sentences using them are the following:
That was the most boring class in the world, the teacher talked so slowly so I fell asleep. Compound sentence formed by three independent clauses linked by a comma first and then by using the coordinator "so".
Since the teacher talked so slowly, I fell asleep. It was the most boring class in the world. Complex sentence formed by two clauses, one dependent and an independent one separated by a comma, the first introduced by the adverb of reason "since". Then, there is an independent clause separated by a period.
It was the most boring class in the world, for the teacher talked so slowly which made me fell asleep. Compound-complex sentence formed by a complex sentence and a simple sentence linked by the coordinator "for". The complex sentence consists of one dependent clause introduced by the relative pronoun "which", that is embedded in an independent clause.