Complex sentence: She worked at Mount Holyoke College as an assistant in the chemistry department until going to the University of Chicago for her senior year in physical chemistry, receiving her B.S. from the University of Chicago in 1905.
Split into simpler sentences: She worked at Mount Holyoke College as an assistant in the chemistry department until she went to the University of Chicago for her senior year in physical chemistry. She received her B.S. from the University of Chicago in 1905.