Simplify the following text for a Grade 12 native English-speaking person.
Original: In 1436 Dufay composed the festive motet Nuper rosarum flores , one of his most famous compositions , which was sung at the dedication of Brunelleschi 's dome of the cathedral in Florence , where Eugene lived in exile .
Simplified: In 1436 Dufay composed the festive motet Nuper rosarum flores , one of his most famous compositions , which was sung at the dedication of Brunelleschi 's dome of the cathedral in Florence .