Which is a compound sentence?

 - Brenna and her sisters drew a map of the United States and hung it on the wall.
 - This loaf of bread is almost stale, but we can make it into bread crumbs for the meatballs.
The first sentence is the compound sentence. It is made up of two independent clauses joined by the coordinating conjunction but.
This loaf of bread is almost stale, but we can make it into bread crumbs for the meatballs.