Types of Sentences

Ever since I hit it with a football last week, the screen on my TV won't stop flickering.

Jurassic Park is a great book.

A simple sentence contains a subject and a predicate and expresses a single idea.

The dog ran across the street.

I went to the store for milk, but I only bought bread.

Will you please go to the park with me?

Because I am too short, I cannot reach the top shelf.

Identify the dependent clause in the following sentence.

You will get a speeding ticket if you are not obeying the law.

Identify the independent clause in the following sentence.

Mom had to stop for gas because the car was on empty.

What is the comma rule for complex sentences?