Complex sentence: The severely underpopulated New France almost fell completely to hostile Iroquois forces in 1660, when settler Adam Dollard des Ormeaux led a Canadian and Huron militia against a much larger Iroquois force; none of the Canadians survived, but they succeeded in turning back the Iroquois invasion.
Split into simpler sentences: The severely underpopulated New France almost fell completely to hostile Iroquois forces. In 1660, settler Adam Dollard des Ormeaux led a Canadian and Huron militia against a much larger Iroquois force; none of the Canadians survived, but they succeeded in turning back the Iroquois invasion.