A compound sentence has at least two independent clauses that have related ideas. The independent clauses can be joined by a coordinating conjunction (for, and, nor, but, or, yet, so) or by a semicolon, as you can see in the compound sentence examples below.
Answer: A compound sentence is made up of two independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, or so) and a comma or by a semicolon alone.