Complex sentence: Stile Project is a website founded by writer and webmaster Stile who founded the site when he was in high school, and ran it for 12 years under the alias Jay Stile.
Split into simpler sentences: Stile Project is a website founded by writer and webmaster Stile. Stile started the site when he was in high school, and ran it for 12 years under the alias Jay Stile.