Complex sentence: With this marriage, her mother hoped to bind her family closer to the House of Hesse; the Grand Duke of Hesse-Darmstadt, however, regarded William's marriage as morganatic and refused to acknowledge the five children from this marriage as Hessian princes.
Split into simpler sentences: With this marriage, her mother hoped to bind her family closer to the House of Hesse. However, the Grand Duke of Hesse-Darmstadt regarded William's marriage as morganatic and refused to acknowledge the five children from this marriage as Hessian princes.