Complex sentence: The auto mechanic has a physically demanding job, often exposed to temperature extremes and well as lifting heavy objects and staying in uncomfortable positions for extended periods as well as exposure to gasoline, asbestos, and other toxic chemicals.
Split into simpler sentences: The auto mechanic has a physically demanding job, often exposed to extreme temperatures, lifting heavy objects and staying in uncomfortable positions for extended periods. They also deal with exposure to gasoline, asbestos, and other toxic chemicals.