Simplify the following text for a Grade 8 native English-speaking person.
Original: In his first act as King , Charles attempted to unify the House of Bourbon by granting the style of Royal Highness to his cousins of House of OrlÃ ans , who had been deprived of this by Louis XVIII because of the former Duke of OrlÃ ans ' role in the death of Louis XVI .
Simplified: Charles ' first act as King of France was to grant the style of Royal Highness to his cousins of the cadet branch of the House of Bourbon , the OrlÃ ans . Because the Duke of Orleans had voted the death of his brother Louis XVI , Louis XVIII had greatly disliked the OrlÃ ans family .