Complex sentence: The Yola people used a number of unique customs that were thought to have originated in the old Duchy of Normandy, these included mumming, patrons and the tradition of placing funeral crosses on roadway trees, which still continue to this day.
Split into simpler sentences: The Yola people used a number of unique customs that were thought to have originated in the old Duchy of Normandy. These included mumming, patrons, and the tradition of placing funeral crosses on roadway trees, which still continue to this day.