Complex sentence: Finally, she married David Pleydell-Bouverie, born on 20 April 1911, grandson of William Pleydell-Bouverie, 5th Earl of Radnor.
Split into simpler sentences: Finally, she married David Pleydell-Bouverie. He was born on 20 April 1911, and was the grandson of William Pleydell-Bouverie, 5th Earl of Radnor.