Complex sentence: Vaughan contested 77 amateur boxing bouts at Schoolboy, Junior and Senior level, he formed Vaughan Promotions in 1990 to promote professional boxing promotions in the United Kingdom.
Split into simpler sentences: Vaughan contested 77 amateur boxing bouts at Schoolboy, Junior and Senior level. He formed Vaughan Promotions in 1990 to promote professional boxing promotions in the United Kingdom.