Simplify the following text for a Grade 10 native English-speaking person.
Original: Proteins are also necessary in animals ' diets , since animals can not synthesize all the amino acids they need and must obtain essential amino acids from food .
Simplified: Animals eat proteins and break them down into amino acids in order to recombine them into other things needed , including other proteins and other amino acids . Animals have certain amino acids they are not able to create this way , and must get from their food .