Complex sentence: John Percival (27 September 1834--3 December 1918) was the first Headmaster of Clifton College, where he made his reptuatation as a great educator.
Split into simpler sentences: John Percival (27 September 1834--3 December 1918) was the first Headmaster of Clifton College. It was at Clifton he made his reptuatation as a great educator.