Complex sentence: Serhiy Derevianchenko (born October 31,1985 in Feodosiya, Ukrainian SSR) is a Ukrainian professional boxer who won the bronze medal at middleweight at the 2007 World Amateur Boxing Championships.
Split into simpler sentences: Serhiy Derevianchenko (born October 31,1985) is a Ukrainian professional boxer. As an amateur, he won the bronze medal at middleweight at the 2007 World Amateur Boxing Championships.