Simplify the following text for a Grade 11 native English-speaking person.
Original: Geoffrey Ronald Burbidge FRS ( 24 September 1925 â `` 26 January 2010 ) was an English astronomy professor , most recently at the University of California , San Diego .
Simplified: Geoffrey Burbidge ( born Chipping Norton , 24 September 1925 ; died La Jolla , California , 26 January 2010 ) was an English astrophysicist . For many years he was professor at the University of California , San Diego .