Complex sentence: On a famous incident, Christina entered the hall Galerie des Cerfs, were the king and his court was gathered, and dressed in her widow's black and a white veil begged him to take all he wished but her son.
Split into simpler sentences: On a famous occasion, Christina entered the hall Galerie des Cerfs, where the king and his court were gathered. Dressed in her widow's black and a white veil, begged him to take all he wished save her son.