Simplify the following text for a Grade 14 native English-speaking person.
Original: Many operas were performed there , including first performances of Mussorgsky 's Boris Godunov , Rimsky-Korsakov 's The Golden Cockerel , Tchaikovsky 's The Queen of Spades and Iolanthe , Prokofiev 's Romeo and Juliet and Cinderella , and Khachaturian 's Spartacus were also produced there .
Simplified: Other world premieres given at the house included Mussorgsky 's opera Boris Godunov in 1874 , Tchaikovsky 's operas The Queen of Spades in 1890 and Iolanta in 1892 , the revised version of Prokofiev 's ballet Romeo and Juliet in 1940 , and Khachaturian 's ballet Spartacus in 1956 . Other notable productions included Rimsky-Korsakov 's opera The Golden Cockerel in 1909 and Prokofiev 's ballet Cinderella in 1946 ( with Natalya Dudinskaya ) .