Complex sentence: She was christened Edith, and Robert Curthose stood as godfather at her christening--the Queen of England Matilda of Flanders was also present at the font and may have been her godmother.
Split into simpler sentences: She was christened Edith, and Robert Curthose stood as godfather at her christening. Queen Matilda was also present at the font and may have been her godmother.