Complex sentence: Concentrating on his writing for the next several years, Galt lived at times in London, Glasgow, Edinburgh and elsewhere, writing fiction and a number of school texts under the pseudonym Reverend T. Clark.
Split into simpler sentences: Concentrating on his writing for the next several years, Galt lived at times in London, Glasgow, Edinburgh and elsewhere. In addition to fiction, he also wrote a number of school texts under the pseudonym Reverend T. Clark.