Complex sentence: This often causes confusion to the outside world, since both the New York Tuscarora and the North Carolina Tuscarora both call themselves Tuscarora, and are both descended from the ancient "Skarure" as they called themselves.
Split into simpler sentences: This often causes confusion to observers, since both the New York Tuscarora and the North Carolina Tuscarora call themselves Tuscarora. Members of both groups claim to be descended from the ancient "Skarure" as they called themselves.