Complex sentence: Wood joined his other brother Ted in setting up a graphic design business but continued to perform on a semi-professional basis with the Downliners Sect and with reunited versions of the Artwoods, with occasional guest appearances by his brother Ronnie.
Split into simpler sentences: Wood joined his other brother Ted in setting up a graphic design business. He also occasionally played with the Downliners Sect, with reunited versions of the Artwoods, and with his brother Ronnie.