Complex sentence: Yves is called to a private audience with the Empress Maud, who officially rebukes him for disturbing the peace, at the same time hinting that she would be delighted if de Soulis were to be killed.
Split into simpler sentences: Yves is called to a private audience with the Empress Maud. She officially rebukes him for disturbing the peace, at the same time hinting that she would be delighted if de Soulis were to be killed.