Complex sentence: Alberta tar sands produced approximately 1.9 million barrels of oil per day in 2012, but if industry and government's expansion plans are approved that number could reach 5 million barrels per day by the end of 2030.
Split into simpler sentences: Alberta tar sands produced approximately 1.9 million barrels of oil per day in 2012. If industry and government's expansion plans are approved this number could reach 5 million barrels per day by the end of 2030.