Simplify the following text for a Grade 10 native English-speaking person.
Original: Serving as a Senior Research Mathematician at Princeton University during the later part of his life , he shared the 1994 Nobel Memorial Prize in Economic Sciences with game theorists Reinhard Selten and John Harsanyi .
Simplified: He shared the 1994 Memorial Prize in Economics with two other game theorists , Reinhard Selten and John Harsanyi .