What clauses make up a compound sentence?

A compound sentence is made up of two or more simple sentences. (Independent clauses)

They are conjoined by coordinating conjunctions.

Coordinating conjunctions can either be simple or correlative.

Simple conjunctions:

For

And

Nor

But

Or

Yet

So

A helpful acronym to remember these is FANBOYS.

Correlative conjunctions:

both....and

not only.....but

either....or

neither....nor