Complex sentence: He is a former WBO super featherweight and lightweight champions and He is the current WBA super lightweight champion and also has held the Commonwealth super featherweight title as well as having challenged for both the British and European titles.
Split into simpler sentences: He is a former WBO super featherweight and lightweight champion and the current WBA super lightweight champion. He has also has held the Commonwealth super featherweight title as well as having challenged for both the British and European titles.