Complex sentence: Total sales fell to 4,261 units in 1990 and 2,240 through July, 1991 which caused the company to cease U.S. and Canada operations after 33 years.
Split into simpler sentences: Total sales fell to 4,261 units in 1990 and 2,240 through July, 1991. This caused the company to cease U.S. and Canada operations after 33 years.