Complex sentence: This led to a feud between Rollins and Reigns, where a singles match was set up for Night of Champions on September 21, even though six days before the pay-per-view event he cleanly defeated Rollins in a singles match on "Raw".
Split into simpler sentences: This led to a feud between Rollins and Reigns, where a singles match was set up for Night of Champions. However, six days before the pay-per-view, Reigns cleanly defeated Rollins in a singles match on "Raw".