Complex sentence: Vakoč celebrated success in one day races during his fourth professional season, winning three major races; he won the Classic Sud-Ardèche and La Drôme Classic over successive days in February.
Split into simpler sentences: Vakoč celebrated success in one day races during his fourth professional season, winning three major races. The Czech cyclist won back to back races Classic Sud-Ardèche and La Drôme Classic in February.