Complex sentence: In September she defended successfully the junior Mountain bike world championships in MTB at Mont-Sainte-Anne in Canada, becoming the second rider after Nicole Cooke to hold both World Championship titles in the same year on the road and in mountain biking.
Split into simpler sentences: In September she defended the junior Mountain bike world championships in mountain biking juniors at Mont-Sainte-Anne in Canada. She later kept this title, becoming the second rider after Nicole Cooke to hold both World Championship titles in the same year on the road and in mountain biking.