Complex sentence: In 1813 he returned to Scotland, settled at Glasgow as a portrait-painter, practising with considerable local success for about twenty years, and exhibited at the Royal Scottish Academy in Edinburgh in 1828,1829, and 1830.
Split into simpler sentences: In 1813 he returned to Scotland and settled in Glasgow as a portrait-painter, practising with considerable local success for about twenty years. He exhibited at the Royal Scottish Academy in Edinburgh in 1828,1829, and 1830.