Complex sentence: David William Donald Cameron, (born 9 October 1966) is a British politician and statesman, who served as Prime Minister of the United Kingdom from 11 May 2010 to 13 July 2016, and Leader of the Conservative Party from 2005 to 2016.
Split into simpler sentences: David William Donald Cameron, (born 9 October 1966) is a British politician and statesman. He has served as the Member of Parliament for Witney since 2001 and was Prime Minister of the United Kingdom from 2010 to 2016 as well as Leader of the Conservative Party from 2005 to 2016.