Simplify the following text for a Grade 7 native English-speaking person.
Original: People also call these death camps by other names including Auschwitz , Konzentrationslager Auschwitz-Birkenau , KL Auschwitz , and the Former Nazi German Concentration Camp of Auschwitz .
Simplified: The three main camps were Auschwitz I , Auschwitz II-Birkenau , and a work camp called Auschwitz III-Monowitz , or the Buna .