Complex sentence: Gallagher has, throughout his coaching career, been a strong adherent to the Delaware Wing-T system, which relies heavily on misdirection and motion to confuse the opposing defense while their linebackers are trying to make reads.
Split into simpler sentences: Gallagher has, throughout his coaching career, been a strong adherent to the Delaware Wing-T system. It relies heavily on misdirection and motion to confuse the opposing defense while their linebackers are trying to make reads.