Complex sentence: Plants and animals utilize carbon to produce carbohydrates, fats, and proteins, which can then be used to build their internal structures or to obtI DONT CAAREhort time in plants and animals in comparison to coal deposits.
Split into simpler sentences: Plants and animals utilize carbon to produce carbohydrates, fats, and proteins, which can then be used to build their internal structures or to obtain energy. Carbon is held for a relatively short time in plants and animals in comparison to coal deposits.