Complex sentence: The enforcement of the Tea Act of 1773 became a heated issue with the colonists, with the well-known demonstration at the Boston harbor, the Boston Tea Party, a direct reaction to the act.
Split into simpler sentences: The enforcement of the Tea Act of 1773 though became a heated issue with the colonists. As noted earlier, the well-known demonstration at the Boston harbor, the Boston Tea Party, was a direct reaction to the act.