Complex sentence: After improving to 14 consecutive wins, he then won the WBO Africa light-welterweight title in October 2012 via victory over James Onyango, and went on to make six successful defenses between 2014 and 2016.
Split into simpler sentences: After improving to 14 consecutive wins, he won the WBO Africa light-welterweight title in October 2012 via victory over James Onyango. Indongo went on to make six successful defenses of that title between 2014 and 2016.