Complex sentence: When heated, Fe (CO) 5 converts to small amounts of the metal cluster Fe 3 (CO) 12, a green solid, although simple thermolysis is not a useful synthesis (see below).
Split into simpler sentences: When heated, Fe (CO) 5 converts to small amounts of the metal cluster Fe 3 (CO) 12, a green solid. Simple thermolysis, however, is not a useful synthesis (see below).