Complex sentence: The sutler of Washington's force was John Fraser, who earlier had been second-in-command at Fort Prince George and who would later serve as Chief Scout to General Edward Braddock and then Chief Teamster to the Forbes Expedition.
Split into simpler sentences: The sutler of Washington's force was John Fraser, who earlier had been second-in-command at Fort Prince George. Later he served as Chief Scout to General Edward Braddock and then Chief Teamster to the Forbes Expedition.