Complex sentence: The Montney Formation is a major shale gas and shale oil resource with reserves of 449 trillion cubic feet of marketable natural gas, 14,521 million barrels of marketable natural gas liquids (NGLs) and 1,125 million barrels of oil.
Split into simpler sentences: The Montney Formation is a major shale gas and shale oil resource. This study found that the potential resources contained within the formation were 449 trillion cubic feet of marketable natural gas, 14,521 million barrels of marketable natural gas liquids (NGLs) and 1,125 million barrels of oil.