Simplify the following text for a Grade 4 native English-speaking person.
Original: Adela of Normandy also known as Adela of Blois and Adela of England and also Adela , Princess of The English ( c. 1062 or 1067 -- 8 March 1137 ? )
Simplified: Adela of Normandy ( c. 1067 â `` c. March 8 , 1137 ) was the daughter of William I of England and Matilda of Flanders .