Simplify the following text for a Grade 11 native English-speaking person.
Original: Three years later , JaurÃ s , Allemane and the possibilists founded the possibilist French Socialist Party , which supported participation in government , while Guesde and Vaillant formed the Socialist Party of France , which opposed such co-operation .
Simplified: Three years later , JaurÃ s , Allemane and the possibilists founded the French Socialist Party while Guesde and Vaillant formed the Socialist Party of France .