Complex sentence: He specialized in competing in the one-day classic cycle races and has won such races as Paris-Roubaix, Gent-Wevelgem, Paris-Brussels and is the only three-time consecutive winner of the Belgian semi-classic La Flèche Wallonne.
Split into simpler sentences: He specialized in one-day classic cycle races and won Paris-Roubaix, Gent-Wevelgem, Paris-Brussels. He is the only three-time consecutive winner of La Flèche Wallonne.