Complex sentence: Alison Jane Cooper (born 31 March 1966) is a British businesswoman, who is the chief executive officer (CEO) of Imperial Tobacco, the world's fourth-largest tobacco company as measured by market share.
Split into simpler sentences: Alison Jane Cooper (born 31 March 1966) is a British businesswoman. She is currently the Chief Executive Officer (CEO) of Imperial Tobacco, the world's fourth-largest tobacco company as measured by market share.