Complex sentence: He became Minister of industry and Commerce in the Quebec government, and was Chairman of the Treasury Board from June 1988 until January 1994, when he became leader of the Quebec Liberal Party and Premier of Quebec following the resignation of Liberal leader Robert Bourassa.
Split into simpler sentences: He became Minister of industry and Commerce in the Quebec government, and was Chairman of the Treasury Board from June 1988 until January 1994. In January 1994, he became leader of the Quebec Liberal Party and Premier of Quebec following the resignation of Liberal leader Robert Bourassa.