Complex sentence: Badou Johannes Gabriel Jack (born 31 October 1983) is a Swedish professional boxer who has held the WBA light heavyweight title since August 2017, having previously held the WBC super middleweight title from 2015 to 2017.
Split into simpler sentences: Badou Johannes Gabriel Jack (born 31 October 1983) is a Swedish professional boxer. He is a two-weight world champion, having held the WBA (Regular) light heavyweight title since August 2017, and previously the WBC super middleweight title from 2015 to 2017.