Complex sentence: He returned to the Cabinet in the wake of Brian Mulroney's landslide victory in the 1984 general election becoming Minister of Fisheries and Oceans but was forced to resign in 1985 as a result of the "Tainted Tuna" affair.
Split into simpler sentences: He returned to the Cabinet in the wake of Brian Mulroney's landslide victory in the 1984 federal election, and became Minister of Fisheries and Oceans. He was forced to resign in 1985 as a result of the "Tainted Tuna" affair.