Simplify the following text for a Grade 11 native English-speaking person.
Original: Every facet of life in the prison was strictly set out by a bloated and intricate prison regulation scheme designed before the prisoners ' arrival by the Four Powers â '' France , Britain , the Soviet Union , and the United States .
Simplified: Every part of life in the prison was strictly set out by a set of rules designed before the prisoners ' arrival by the Four Powers â '' France , Britain , the Soviet Union , and the United States .