Simplify the following text for a Grade 8 native English-speaking person.
Original: In the Autumn of 1968 he returned to France , where he published L'arch Ã ologie du savoir ( The Archaeology of Knowledge ) â '' a methodological treatise that included a response to his critics â '' in 1969 .
Simplified: In 1968 he returned to France , where he published L'arch Ã ologie du savoir ( The Archaeology of Knowledge ) .