Complex sentence: He was educated at Merchant Taylors' School, Northwood, Middlesex and University College School, London, briefly joined Richer Sounds as a salesman and then WCRS advertising in 1981.
Split into simpler sentences: He was educated at Merchant Taylors' School, Northwood and University College School, London. After briefly joining Richer Sounds as a salesman he went to work for WCRS advertising in 1981.