Complex sentence: Other later math systems including Sagarin-ELO, Boand, Poling and Billingsley all retroactively backed the real-time assessments, as did Helms, the College Football Researchers Association and the National Championship Foundation.
Split into simpler sentences: Other later math systems including Sagarin-ELO, Boand, Poling and Billingsley all retroactively backed the real-time assessments. As did Helms, the College Football Researchers Association and the National Championship Foundation.