Simplify the following text for a Grade 9 native English-speaking person.
Original: Unfortunately , Nijinsky 's new trends in dance caused a riotous reaction at the ThÃ Ã cents tre de Champs - Ã lysÃ es when they premiered in Paris .
Simplified: The music and dance caused a riotous reaction at the ThÃ Ã cents tre de Champs - Ã lysÃ es when they premiered in Paris .