Complex sentence: The Tories lost the 2003 general election, but Munro was able to retain her seat by a reduced margin, and became the opposition critic of Minister of Community and Social Services Madeleine Meilleur.
Split into simpler sentences: The Tories lost the 2003 general election, but Munro was able to retain her seat by a reduced margin. She became the opposition critic of Minister of Community and Social Services Madeleine Meilleur.