Complex sentence: Congress had several session agreements regarding the White Earth Band of Ojibwe Native Americans of Otter Tail Pillager Band of Chippewa Indians and Wild Rice River Pembina Band of Chippewa Indians eventually came to settle alongside the Mississippi Chippewa.
Split into simpler sentences: Congress had several session agreements regarding the White Earth Band of Ojibwe. These Native Americans of the Otter Tail Pillager Band of Chippewa Indians and Wild Rice River Pembina Band of Chippewa Indians eventually came to settle alongside the Mississippi Chippewa.