"Aware of" is actually correct. I think "aware about" is colloquial. So it should be "Ever since I became aware of the benefits of reading on our brain."

Native English speaker here. No one would say "aware about" in the US at least.

Thank you Angela. You are correct. I think It's a dependent clause.

To make sure you know, this is not a complete sentence. That period should be a comma and you need to say what has happened since you became aware to finish the sentence off.