When two simple sentences are combined, it becomes a compound sentence.
Mom will drive us. Dad will stay home.
These are two simple sentences. Each simple sentence has one subject doing one thing.
We can combine the two simple sentences with a comma and the conjunction and.
Mom will drive us, and Dad will stay home.
Here are some more examples of a compound sentence:
The sky is cloudy, and the wind is cold.
I did my homework, and I can watch television.
My dog is sleeping, and he makes funny noises.
A compound sentence is made up of two simple sentences joined by the word and.
▶It’s your turn. Join these two simple sentences into a compound sentence using the word and with a comma. We have a new car. I can drive it. That was easy, wasn’t it?