Complex sentence: Even Fersen could not convince her to leave without the King; the Queen wanted the King to come with her both because she loved the King, the father of her children and because she was aware that without the King she would lose all her political powers.
Split into simpler sentences: Even Fersen could not convince her to leave without the King, the Queen wanted the King to come with her for both personnel and political reasons. First she loved the King who was the father of her children, second she was aware that without the King she would lose all her political powers.