Complex sentence: Boudreau ran to succeed Montpetit in the 2009 municipal election as a candidate of Gérald Tremblay's Union Montreal party and was narrowly defeated by Benoit Dorais of Vision Montreal.
Split into simpler sentences: Boudreau ran to succeed Montpetit in the 2009 municipal election as a candidate of Gérald Tremblay's Union Montreal party. She was narrowly defeated by Benoit Dorais of Vision Montreal.