Complex sentence: Kabary Salem is a former professional boxer who is famous for fighting Joe Calzaghe for the WBO super middleweight title in October 2004 and managed to knock Calzaghe down in the 4th round, however he lost the contest on points.
Split into simpler sentences: Kabary Salem is a former professional boxer who is famous for fighting Joe Calzaghe for the WBO super middleweight title in October 2004. Salem managed to knock Calzaghe down in the 4th round, however he lost the contest on points.