Complex sentence: Coming to Edinburgh with an introduction to James Gillespie Graham the architect, who proved a helpful patron, he worked as an ornamental sculptor, and on 26 February 1822 entered the Trustees' Academy, Edinburgh, then on Picardy Place.
Split into simpler sentences: Coming to Edinburgh with an introduction to the architect James Gillespie Graham,, who proved a helpful patron, he worked as an ornamental sculptor. On 26 February 1822 he entered the Trustees' Academy, Edinburgh, then on Picardy Place.