Complex sentence: He was educated at a private school, and after some years spent as mathematical master at Queen Elizabeth's College, Guernsey, he went to London, where he devoted himself to journalism in the Conservative interest, becoming a prolific author, writing largely for periodicals.
Split into simpler sentences: He was educated at a private school, and after some years spent as mathematical master at Queen Elizabeth's College, Guernsey, he went to London. In London, Collins devoted himself to journalism in the Conservative interest, writing largely for periodicals.