Complex sentence: From 1775 until 1797, Georges-Hippolyte served as a transport officer in the militia for supplies in the Montreal district and was imprisoned at Fort Chambly by the Americans after the capture of Montreal.
Split into simpler sentences: From 1775 until 1797, he served as a transport officer in the militia for supplies in Montreal district. He was imprisoned at Fort Chambly by the Americans after the capture of Montreal.