Complex sentence: The Plaquemine Culture occupied the rest of Louisiana not taken by the Caddoan Mississippian culture during this time frame and are considered descendants of the Troyville-Coles Creek culture.
Split into simpler sentences: The Plaquemine Culture occupied the rest of Louisiana not taken by the Caddoan Mississippian culture during this time frame. Its people are considered descendants of the Troyville-Coles Creek culture.