Simplify the following text for a Grade 9 native English-speaking person.
Original: However , the new king , Louis XVIII , knew that ideas of nationalism and democracy still lingered in his country ; hence the establishment and signing of the Charte constitutionnelle franÃ aise , the French Constitution otherwise known as La Charte .
Simplified: However , the new king , Louis XVIII , felt that ideas of nationalism and democracy were still in his country . So , they made and signed the Charte constitutionnelle franÃ aise , the French Constitution .