Complex sentence: He was Headmaster of Eton College between 1964 and 1970 and, under his Headship, Eton was reformed with the introduction of sciences in the junior years, the end of corporal punishment between boys and a reformed curriculum.
Split into simpler sentences: He was Headmaster of Eton College between 1964 and 1970. Under his headmastership, Eton was reformed with the introduction of sciences in the junior years, the end of corporal punishment between boys and a reformed curriculum.