Complex sentence: Riding against the strike upset several of the country's top riders including Jerry Bailey, Jean Cruget, Jorge Velásquez and other's, but by riding during the strike, Vega picked up mounts that gave him the two biggest wins of his career.
Split into simpler sentences: Riding against the strike upset several of the country's top riders including Jerry Bailey, Jean Cruget, and Jorge Velásquez. By riding during the strike, he picked up mounts that gave him the two biggest wins of his career.