Simplify the following text for a Grade 11 native English-speaking person.
Original: The camp was staffed partly by prisoners , some of whom were selected to be kapos ( orderlies , most of whom were convicts ) and sonderkommandos ( workers at the crematoria ) .
Simplified: The SS used some prisoners for different works in the camp like kapos ( orderlies ) and sonderkommandos ( workers at the crematoria ) .