Simplify the following text for a Grade 9 native English-speaking person.
Original: After World War II , Allied forces established three federal states : WÃ 1\/4 rttemberg-Hohenzollern , Baden ( both occupied by France ) , and WÃ 1\/4 rttemberg-Baden ( US-occupied ) .
Simplified: In 1952 , the three states of Baden , WÃ 1\/4 rttemberg-Baden and WÃ 1\/4 rttemberg-Hohenzollern joined together to found Baden-W Ã 1\/4 rttemberg .