Complex sentence: Mansfield State Historic Site is a preservation of the 1864 Battle of Mansfield in the American Civil War, located four miles south of Mansfield, the seat of De Soto Parish in northwestern Louisiana.
Split into simpler sentences: Mansfield State Historic Site is a preserves the site of the 1864 Battle of Mansfield in the American Civil War. It is located four miles south of Mansfield, the seat of De Soto Parish in northwestern Louisiana.