Complex sentence: She is the Canadian Youth (17 and under) record holder in the 100m, which she set when she won the Canadian Junior Championships with a time of 11.54 +1.4m/s in Saskatoon on July 4,2003, running in a higher age category.
Split into simpler sentences: She is the Canadian Youth (17 and under) record holder in the 100m. She won the Canadian Junior Championships with a time of 11.54 +1.4m/s in Saskatoon on July 4,2003, running in a higher age category.