Complex sentence: Copper Inuit are northern Canadian Inuit who live in the area around Coronation Gulf, north of the tree line, in Nunavut's Kitikmeot Region and the Northwest Territories's Inuvik Region, mostly on Victoria Island and southern Banks Island.
Split into simpler sentences: Copper Inuit are northern Canadian Inuit who live north of the tree line, in Nunavut's Kitikmeot Region and the Northwest Territories's Inuvik Region. Most lived in the area around Coronation Gulf, on Victoria Island, and southern Banks Island.