Simplify the following text for a Grade 7 native English-speaking person.
Original: Foucault 's tenure at Vincennes was short-lived , as in 1970 he was elected to France 's most prestigious academic body , the CollÃ ge de France , as Professor of the History of Systems of Thought .
Simplified: In 1970 , Foucault became a Professor of the History of Systems of Thought at the CollÃ ge de France .