Simplify the following text for a Grade 10 native English-speaking person.
Original: The Princess Mary , Duchess of Gloucester and Edinburgh ( 25 April 1776 â `` 30 April 1857 ) was a member of the British Royal Family , the eleventh child and fourth daughter of George III .
Simplified: Princess Mary , Duchess of Gloucester and Edinburgh ( 25 April 1776 â `` 30 April 1857 ) was the fourth daughter and eleventh child of George III and Queen Charlotte .