Complex sentence: The Ipnavik River is a long tributary of the Colville River in the North Slopes of Alaska which was part of the traditional lands of the Iñupiat, who named it "Ipnavak" which means "place where young Dall sheep grow up".
Split into simpler sentences: The Ipnavik River is a long tributary of the Colville River in the Alaska North Slope. The name is from the Iñupiat language and means "place where young Dall sheep grow up".