Original sentence: During his prime he was the most feared man in the heavyweight division, but his once promising career was undermined by personal problems, lack of preparation, and periods of imprisonment.He was nicknamed "Iron" Mike Tyson, Kid Dynamite, and The Baddest Man on the Planet.Michael Gerard Tyson (born June 30, 1966, Brooklyn, New York, USA) is a former American professional boxer and World Heavyweight Champion.The youngest man to win a heavyweight title belt, he was rated by The Ring magazine in a 1999 listing as the fourteenth greatest heavyweight of all time.Upon release following his first prison sentence, he made a heavily anticipated comeback but failed to reclaim his previous dominance
Edited sentence: His once promising career was undermined by serious personal problems, lack of preparation, and periods of imprisonment.In his prime, he routinely defeated prominent opponents by knock out in the early rounds, and was one of the most feared boxers in the sport for his knockout power and aggression, earning him nicknames such as "Iron" Mike Tyson, Kid Dynamite, and The Baddest Man on the Planet.Michael Gerard Tyson (born June 30, 1966, Brooklyn, New York, USA) is a former American professional boxer and World Heavyweight Champion, and is considered by many to be one of the greatest heavyweight boxers of all time.Upon release following his first prison sentence, he made a heavily anticipated comeback, but failed to reclaim his previous dominance