Complex sentence: The majority of the mound was built from 1200-1400 CE. The site has the largest mound of the Caddoan Mississippian culture (a regional variation of the Mississippian culture), and measures approximately in length, wide, and in height.
Split into simpler sentences: The majority of the mound was built from 1200-1400 CE. The site has the largest mound of the Caddoan Mississippian culture (a regional variation of the Mississippian culture). It measures approximately in length, wide, and in height.