Complex sentence: Carbon dioxide is also produced by combustion of coal or hydrocarbons, the fermentation of sugars in beer and winemaking, and during by the respiration of animals, exhaled in the breath of humans and land animals.
Split into simpler sentences: Carbon dioxide is also produced by combustion of coal or hydrocarbons, the fermentation of sugars in beer and winemaking, and by animal respiration of animals. It is exhaled in the breath of humans and land animals.