Answer:
I walked up to the door, and I rang the bell. I asked if Ricky was home, but Ms. Lasko said Ricky was fishing with his Aunt Bertha. Fishing sounded like a good idea, so I went home to get my pole and bait.
Explanation:
A compound sentence is simply a sentence that connect at least two independent clauses using a conjunction such as: for, and, nor, but, yet, or so.
In this case, you can put a comma in-between two sentences and connect them by adding a conjunction after the comma.
For example:
My friends and I went to order a cheese pizza. It tasted great.
My friends and I went to order a cheese pizza, and it tasted great.