Sometimes a compound sentence is combined with a subordinate clause. That makes a compound-complex sentence.
Here is a compound sentence:
I can mow the lawn, and you can rake the leaves.
Now let’s add a subordinate clause to the beginning of this sentence, like this:
If it stops raining, I can mow the lawn, and you can rake the leaves.
We have now written a compound-complex sentence.
Look at these other compound-complex sentences:
While you do the dishes, I can fold the laundry, and Dad can wash the car.
When we get home from school, I might read a book, or I might take a walk.
Adding a subordinate clause to a compound sentence creates a compound-complex sentence.
▶It’s your turn. Add a subordinate clause to this sentence, starting with the subordinating conjunction While. I can sing, and Mom can play the piano. Did you start the sentence with a clause using the word while? Good for you!