Complex sentence: It was at this time he contracted a very intimate friendship with George Stepney and in 1682, when Stepney was elected at Cambridge, he asked to be moved to Cambridge in order to join his friend, without waiting for the advantages of another year.
Split into simpler sentences: It was at this time he contracted a very intimate friendship with George Stepney. In 1682, when Stepney was elected at Cambridge, Montagu asked to be moved to Cambridge in order to join his friend, without waiting for the advantages of another year.