Complex sentence: Bond Head was recalled in late 1837 and replaced with Sir George Arthur who arrived in Toronto in March 1838 and sent Lord Durham, who was assigned to report on the grievances among the colonists and find a way to appease them.
Split into simpler sentences: Bond Head was recalled in late 1837 and replaced with Sir George Arthur who arrived in Toronto in March 1838. He was assigned to report on the grievances among the colonists and find a way to appease them.