Complex sentence: Molson Export beer is an Ale with an ABV of 5%, i.e. a warm-fermented beer, brewed by Molson Canada--a brewery founded in Montreal in 1786, making it North America's oldest.
Split into simpler sentences: Molson Export beer is an ale (i.e. a warm-fermented beer) brewed by Molson Canada at a strengh of 5% alcohol by volume. Molson, founded in Montreal in 1786, is North America's oldest.