Complex sentence: In February 1992, Lauzon argued that Quebec's efforts to create a local stock brokerage industry had been an expensive failure, estimating that tax breaks had cost the province $1.5 billion in revenue without providing much in the way of practical results.
Split into simpler sentences: In February 1992, Lauzon argued that Quebec's efforts to create a local stock brokerage industry had been an expensive failure. He estimated that tax breaks had cost the province $1.5 billion in revenue without providing much in the way of practical results.