Complex sentence: Marion Anderson, O.Ont (born c.1914, date of death unknown) was a Canadian politician, who became, in 1950, the first woman to serve as a First Nations band councillor in Ontario.
Split into simpler sentences: Marion Anderson, O.Ont (born c.1914, date of death unknown) was a Canadian politician. In 1950, she became the first woman to serve as a First Nations band councillor in Ontario.