Complex sentence: As a young boy he was skilled at Karate and Wrestling bye did wrestling for a few years before High school and ten years later he returned to Karate and is now a Second degree Green belt on his way to a Black Belt.
Split into simpler sentences: As a young boy he was skilled at Karate and Wrestling. He did karate for a few years before High school and ten years later he returned to Karate and is now a Second degree Green belt on his way to a Black Belt.