Complex sentence: Harmful pollutants to the health causes diseases and the environment becomes polluted include particulates (soot), hydrocarbons, carbon monoxide, lead, and various oxides of nitrogen.
Split into simpler sentences: Harmful pollutants to the health causes diseases and for the environment, it causes pollution. These polluting gases include particulates (soot), hydrocarbons, carbon monoxide, lead, and various oxides of nitrogen.