Complex sentence: Working for the British North West Company and later the American Fur Company, Cadotte built a trading empire throughout northern Wisconsin and established outposts at the head of the Chippewa River, and at Lac Courte Oreilles.
Split into simpler sentences: Working for the British North West Company and later the American Fur Company, Cadotte built a trading empire throughout northern Wisconsin. He established outposts at the head of the Chippewa River, and at Lac Courte Oreilles.