Complex sentence: Jim Watt (born July 18,1948) is a former Scottish boxer from Glasgow, who became world champion in the lightweight division when Roberto Duran left the title vacant in 1979 and the WBC had him fight Alfredo Pitalua.
Split into simpler sentences: Jim Watt (born July 18,1948) is a former Scottish boxer from Glasgow. Watt became world Lightweight champion when Roberto Duran left the title vacant in 1979 and the WBC had him fight Alfredo Pitalua.