Complex sentence: Although Louis's marriage contract had been signed before a great council of the realm on 5 May 1403, the Duke of Orléans, who had hoped his daughter would marry the dauphin, absented himself.
Split into simpler sentences: Although Louis's marriage contract had been signed before a great council of realm on 5 May 1403. The duke of Orléans, who had hoped his daughter would marry the dauphin, absented himself.