Complex sentence: The Cayson Mound and Village Site is a U.S. National Historic Landmark (designated as such on March 15,1976) located three miles southeast of Blountstown, Florida on the Apalachicola River.
Split into simpler sentences: The Cayson Mound and Village Site is a historic site near Blountstown, Florida, United States. It is located three miles southeast of Blountstown, on the Apalachicola River.