Simplify the following text for a Grade 11 native English-speaking person.
Original: The Burbidges worked at Harvard , the University of Chicago and Cambridge University , before Margaret obtained work at the California Institute of Technology , while Geoffrey worked at the Mount Wilson Observatory and Palomar Observatory .
Simplified: They worked at Harvard , the University of Chicago and Cambridge University . Then Margaret got work at the California Institute of Technology , while Geoffrey worked at the Mount Wilson Observatory and Palomar Observatory .