Simplify the following text for a Grade 8 native English-speaking person.
Original: NÃ stor Carlos Kirchner ( ; 25 February 1950 - 27 October 2010 ) was an Argentine politician who served as the 54th President of Argentina from 25 May 2003 until 10 December 2007 .
Simplified: NÃ stor Kirchner ( February 25 , 1950 - October 27 , 2010 ) was President of Argentina between 2003 and 2007 .