Complex sentence: Princess Amelia was born on 7 August 1783, at the Royal Lodge, Windsor, the youngest of George III and Queen Charlotte's fifteen children as well as the only of her siblings born at Windsor Castle.
Split into simpler sentences: Princess Amelia was born on 7 August 1783, at the Royal Lodge, Windsor, the youngest of George III and Queen Charlotte's fifteen children. She was the only one of King George and Queen Charlotte's fifteen children who was born at Windsor Castle.