Matthew wrote the following simple sentence:

I enjoy playing video games.

How could Matthew revise this sentence to create a complex sentence?

Add another simple sentence, like and creating videos.
Add an independent clause, like and my brother likes swimming.
Add a subordinate clause, like because I win them quickly.
Add another verb, like and reviewing.

One way Matthew could revise the sentence to create a complex sentence is by adding a subordinate clause. For example:

Because I win them quickly, I enjoy playing video games.

This creates a dependent clause (Because I win them quickly) that adds additional information to the sentence.