Complex sentence: Following his graduation from high school, he enlisted as a sailor in the United States Navy and then attended Pace University for three years before eventually going into the acting industry after befriending Matt Dillon and Kevin Dillon.
Split into simpler sentences: Following his graduation from high school, he enlisted in the US Navy. He then attended Pace University for 3 years before eventually going into the acting industry after befriending Matt and Kevin Dillon.