Simplify the following text for a Grade 10 native English-speaking person.
Original: Kristina Kerscher Keneally ( born 19 December 1968 ) is an American born Australian politician and the 42nd Premier of New South Wales .
Simplified: Kristina Kerscher Keneally ( born 19 December 1968 ) is an Australian politician and was the 42nd Premier of New South Wales .