Complex sentence: After passing his driving test at 18 he had several salesman jobs as a travelling photographer; in Sutherland's potted meat factory, at Nova Sewing machines and Dobson's furnishings company.
Split into simpler sentences: After passing his driving test at 18 he had several jobs. He worked as a travelling photographer, worked in Sutherland's potted meat factory, and at Nova Sewing Machines and Dobson's Furnishings Company.