Original: In 1714, at age 11, Wesley was sent to the Charterhouse School in London (under the mastership of John King from 1715), where he lived the studious, methodical and, for a while, the religious life in which he had been trained at home.
Simplified: John was admitted  to Charterhouse school, London, when he lived the stations methodical and (for a while) religious life in which he had been trained at here.