Complex sentence: The British agreed to depart from their forts around the Great Lakes and the United States-Canadian boundary had to be re-adjusted; numerous pre-Revolutionary debts were liquidated, and the British opened their West Indies colonies to American trade.
Split into simpler sentences: The British agreed to depart from their forts around the Great Lakes, and the United States-Canada boundary had to be re-adjusted. Numerous pre-Revolutionary debts were liquidated, and the British opened their West Indies colonies to American trade.