Complex sentence: Starting in 1875, he studied at Trinity College, Cambridge, where he was active in the Cambridge University Musical Society and friends with Charles Villiers Stanford and William Barclay Squire, whose sister Charlotte he married in 1885.
Split into simpler sentences: Starting in 1875, he studied at Trinity College, Cambridge, where he was active in the Cambridge University Musical Society. There he became friends with Charles Villiers Stanford and William Barclay Squire, whose sister Charlotte he married in 1885.