Complex sentence: He made his Grand Tour debut in the 2010 Giro d'Italia where he finished seventh overall and won the young rider classification, by a margin of 7' 29 over Robert Kišerlovski, cementing his place as a rider for the future.
Split into simpler sentences: He made his Grand Tour debut in the 2010 Giro d'Italia where he finished an impressive seventh overall and winning the young rider classification. This was by a margin of 7' 29 over Robert Kišerlovski, cementing his place as a rider for the future.