Complex sentence: Sir Alan Colin Drake Yarrow (born 27 June 1951) was Lord Mayor of London 2014-15 and a British specialist in investment banking, who has served as Chairman of the Chartered Institute for Securities & Investment (CISI) since 2009.
Split into simpler sentences: Sir Alan Colin Drake Yarrow (born 27 June 1951) was Lord Mayor of London 2014-15. He is an investment banker, who has served as Chairman of the Chartered Institute for Securities & Investment (CISI) since 2009.