Simplify the following text for a Grade 5 native English-speaking person.
Original: Beef tripe is usually made from only the first three chambers of a cow 's stomach : the rumen ( blanket\/flat\/smooth tripe ) , the reticulum ( honeycomb and pocket tripe ) , and the omasum ( book\/bible\/leaf tripe ) .
Simplified: Tripe is part of an animal 's stomach often served as food .