Simplify the following text for a Grade 12 native English-speaking person.
Original: Cristina Elisabet FernÃ ndez de Kirchner ( ; born 19 February 1953 ) , commonly known as Cristina FernÃ ndez or Cristina Kirchner , is the 55th and current President of Argentina and the widow of former President NÃ stor Kirchner .
Simplified: Cristina Elisabet FernÃ ndez Viuda de Kirchner ( February 19 , 1953 ) , also called Cristina FernÃ ndez or Cristina Kirchner , is the current President of Argentina .