Simplify the following text for a Grade 9 native English-speaking person.
Original: Havel left office after his second term as Czech president ended on 2 February 2003 ; VÃ clav Klaus , one of his greatest political opponents , was elected his successor on 28 February 2003 .
Simplified: He left office after his second term as Czech president ended on 2 February 2003 ; VÃ clav Klaus was elected his successor on 28 February 2003 . Klaus was one of Havel 's greatest political opponents .