Complex sentence: He was apprenticed to Stephen Henry Gimber, a white engraver and lithographer in the city, before setting up his own shop, engraving portraits and other images for political and non-political books and journals, as well as for individuals.
Split into simpler sentences: He was apprenticed to Stephen Henry Gimber, a white engraver and lithographer in the city. Reason set up his own shop, where he engraved portraits and other images for political and non-political books and journals, as well as for individuals.