Complex sentence: In boxing he held the WBO junior welterweight title in 2014 and challenged for the WBO welterweight title same year; in kickboxing he was an undefeated ISKA World welterweight and WKA World super welterweight champion.
Split into simpler sentences: In boxing he held the WBO junior welterweight title in 2014 and challenged for the WBO welterweight title same year. In kickboxing he was an undefeated ISKA World welterweight and WKA World super welterweight champion.