Complex sentence: Sidestream tobacco smoke is made up of many components, including carbon monoxide, tar, nicotine, ammonia, benzene, cadmium and 4-aminobiphenyl.
Split into simpler sentences: Sidestream tobacco smoke is made up of many components. Its constituents include carbon monoxide, tar, nicotine, ammonia, benzene, cadmium and 4-aminobiphenyl.