Complex sentence: Sumner is one of the two county seats of Tallahatchie County and is located on the west side of the county and the Tallahatchie River, which runs through the county north-south.
Split into simpler sentences: Sumner is one of the two county seats of Tallahatchie County. It is located on the west side of the county and the Tallahatchie River, which runs through the county north-south.