Complex sentence: Notable chiefs among the Coushatta were the successive Long King and Colita (Koasati), who led their people to settle in present-day Polk County, Texas in the late 18th and early 19th centuries.
Split into simpler sentences: Notable chiefs among the Coushatta were Long King and Colita (Koasati), who succeeded him. They led their people to settle in present-day Polk County, Texas in the late 18th and early 19th centuries.