Simplify the following text for a Grade 6 native English-speaking person.
Original: After Robson 's contract expired , he returned to England to take up a position in the Football Association 's technical department , but following the resignation of Ruud Gullit at Newcastle United , Robson moved to St James ' Park in September 1999 .
Simplified: The next year , Robson went back to England to work for the Football Association . Soon after his return , Newcastle United F.C. manager Ruud Gullit quit , and Robson took the manager 's job at St James ' Park .