Simplify the following text for a Grade 9 native English-speaking person.
Original: Published in 1979 , this version premiered on February 24 of the same year at the Opera Garnier and was conducted by Pierre Boulez , with Teresa Stratas singing the lead role ; the production ( by Patrice ChÃ reau ) was a sensation and the recording won the Gramophone Award for 1979 .
Simplified: This completed version was performed in 1979 at the Opera Garnier , conducted by Pierre Boulez .