Complex sentence: Her health fatally undermined by her harrowing lying-in, the princess left Paris for her Château de Meudon where she gave a reception in honour of her father who did not approve of her marriage to Rion and had sent him away from Paris.
Split into simpler sentences: Her health fatally undermined by her harrowing lying-in, the princess left Paris. At Meudon, she gave a reception in honour of her father who did not approve of her marriage to Rion and had sent him away from Paris.