Original sentence: His brother Krzysztof (born 1984) is also a speedway rider who is a 2008 Speedway Grand Prix rider and was the 2005 Individual U-21 World Champion
Edited sentence: His brother Krzysztof (born 1984) is also a speedway rider who was a 2008 Speedway Grand Prix rider and who won the 2005 Individual U-21 World Champion title