Simplify the following text for a Grade 5 native English-speaking person.
Original: Emily Tennessee Donelson ( June 1 , 1807 - December 19 , 1836 ) was the niece of President of the United States Andrew Jackson .
Simplified: Emily Donelson ( June 1 , 1807 â `` December 19 , 1836 ) was the niece of U.S. President Andrew Jackson .