Complex sentence: A furlong is a measure of distance in imperial units and U.S. customary units equal to one-eighth of an international mile, to 220 yards, and to 660 feet or 10 chains.
Split into simpler sentences: A furlong is a measure of distance in imperial units and U.S. customary units. It is equal to one-eighth of an international mile, to 220 yards, and to 660 feet or 10 chains.