Complex sentence: Portia Lucretia Simpson-Miller, ON, MP (born 12 December 1945), is a Jamaican politician who was Prime Minister of Jamaica from March 2006 to September 2007 and again from 5 January 2012 to 3 March 2016.
Split into simpler sentences: Portia Lucretia Simpson-Miller, ON, MP (born 12 December 1945), is a Jamaican politician. She served as Prime Minister of Jamaica from March 2006 to September 2007 and again from 5 January 2012 to 3 March 2016.