Simplify the following text for a Grade 9 native English-speaking person.
Original: Brown announced his candidacy for the Manukau Mayoralty in 2006 , Barry Curtis announced that he would not be running for re-election , and Brown 's main opposition were former Olympic runner Dick Quax and radio personality Willie Jackson .
Simplified: Brown announced that he was running to be the Mayor of Manukau in 2006 . Barry Curtis announced that he would not be running for re-election , and Brown 's main opposition were former Olympic runner Dick Quax and radio host Willie Jackson .