Original sentence: Basso, nicknamed Ivan the Terrible, is among the best mountain riders in the professional field of the 2000s, and is considered one of the strongest stage race riders.He is a winner of the Giro d'Italia, having won the 2006 edition of the Italian Grand Tour whilst riding for Team CSC
Edited sentence: Basso, nicknamed Ivan the Terrible, was among the best mountain riders in the professional field of the 2000s, and was considered one of the strongest stage race riders.He  won the 2006 edition of the Giro d'Italia whilst riding for Team CSC, though the legitimacy of that result is now in doubt