Complex sentence: He stood down from the position in early 1991 and became special assistant on Quebec issues to federal party leader Audrey McLaughlin, a position he continued to hold through to the 1993 Canadian federal election.
Split into simpler sentences: He stood down from the position in early 1991 and became special assistant on Quebec issues to federal party leader Audrey McLaughlin. Tassé continued to serve as McLaughlin's Quebec assistant through to the 1993 Canadian federal election.