Complex sentence: The Menominee have a tribal college, College of Menominee Nation, which includes a Sustainable Development Institute, to educate others and promote their ethic for living in balance on the land.
Split into simpler sentences: The Menominee have a tribally owned college, the College of Menominee Nation, which includes a Sustainable Development Institute. Its goal is education to promote their ethic for living in balance on the land.