Simplify the following text for a Grade 11 native English-speaking person.
Original: More significant than the honor of the prize itself , the official congratulation from the International Committee of the Red Cross marked the overdue rehabilitation of Henry Dunant and represented a tribute to his key role in the formation of the Red Cross .
Simplified: The International Committee of the Red Cross officially congratulated Dunant and was a tribute to his key role in the formation of the Red Cross .