Simplify the following text for a Grade 8 native English-speaking person.
Original: Stoddart has also repeatedly called for the resignation of the FIA 's President , Max Mosley , particularly in the aftermath of the 2005 United States Grand Prix where the majority of teams withdrew from the race due to safety concerns about their Michelin tyres .
Simplified: Several times , Stoddart called for the resignation of Max Mosley , the FIA 's President .