Complex sentence: The following year, leaders who had escaped across the border into the United States raided Lower Canada in February 1838, and a second revolt began at Battle of Beauharnois in November of the same year.
Split into simpler sentences: The following year, leaders who had escaped across the border into the United States raided Lower Canada in February 1838. A second revolt began at Battle of Beauharnois in November of the same year.