Complex sentence: Moundbuilding by people of the various Woodland and Mississippian cultures was common throughout the Mississippi Basin and Ohio Valley, including in Tennessee to the west, Georgia to the southeast, Louisiana to the southwest, and Ohio, Indiana, Illinois, and Missouri to the northwest.
Split into simpler sentences: Moundbuilding by people of the various Woodland and Mississippian cultures was common throughout the Mississippi Basin and Ohio Valley. This included Tennessee to the west, Georgia to the southeast, Louisiana to the southwest, and Ohio, Indiana, Illinois, and Missouri to the northwest.