Complex sentence: The Spirit Lake Tribe (In Santee Sioux: "Mni Wakan Oyate", formerly Devils Lake Sioux) is a Sioux tribe and its reservation is located in east-central North Dakota on the southern shores of Devils Lake.
Split into simpler sentences: The Spirit Lake Tribe (In Santee Sioux: "Mni Wakan Oyate", formerly Devils Lake Sioux) is a Sioux tribe. Its reservation is located in east-central North Dakota on the southern shores of Devils Lake.