Complex sentence: Laura Cornelius Kellogg was an advocate for the renaissance and sovereignty of the Six Nations of the Iroquois, and remains a controversial figure in 20th century Iroquois politics in the U.S. and Canada.
Split into simpler sentences: Laura Cornelius Kellogg was an advocate for the renaissance and sovereignty of the Six Nations of the Iroquois. Kellogg remains a controversial figure in 20th century Iroquois politics in the U.S. and Canada.