Complex sentence: As a senior at Mount Tabor High School, Montgomery won the North Carolina Class 4A NCHSAA girls individual station cross country championships in Kernersville in 2013.
Split into simpler sentences: As a senior at Mount Tabor High School, Montgomery won the North Carolina Class 4A state cross country championship. She won the Class 4A NCHSAA girls individual station championships in Kernersville in 2013.