Complex sentence: These successes, as well as some other strong performances in mountain stages, earned Majka the polka dot jersey as winner of the mountains classification, becoming the first Polish rider to win a jersey in the Tour de France.
Split into simpler sentences: These successes, as well as some other strong performances in mountain stages, earned Majka the polka dot jersey as winner of the mountains classification. Thus he became the first Pole to win a jersey in the Tour de France.