Complex sentence: The Liberals were defeated by the NDP in the provincial election of 1990; most ridings in northern Ontario were won by the NDP, and Brown was only able to defeat NDP candidate Lois Miller by 207 votes.
Split into simpler sentences: The Liberals were defeated by the NDP in the provincial election of 1990. Most ridings in northern Ontario were won by the NDP, and Brown was only able to defeat NDP candidate Lois Miller by 207 votes.