Simplify the following text for a Grade 7 native English-speaking person.
Original: During a collective hunger strike in 1974 , which led to the death of Meins , philosopher Jean-Paul Sartre visited Baader in Stammheim Prison where he was being held .
Simplified: Meins died during a hunger strike in Stammheim Prison in 1974 . This was when philosopher Jean-Paul Sartre visited Baader .