Complex sentence: In addition to the possibility of a brokered convention, a dispute over seating delegates from Florida and Michigan led some to compare the year's convention with the 1968 Democratic National Convention, which ended in a divided party and unhappiness over the outcome.
Split into simpler sentences: In addition to the possibility of a brokered convention, a dispute over seating delegates from Florida and Michigan led some to compare the year's convention with the 1968 Democratic National Convention. It ended in a divided party and unhappiness over the outcome.