Complex sentence: On February 16,2012 Angela Gheorghiu opened the 2012 Vienna Opera Ball with the "Habanera" from "Carmen" and "I Could Have Danced All Night" from "My Fair Lady", accompanied by Vienna Opera Orchestra conducted by Georges Pretre.
Split into simpler sentences: On February 16,2012 Angela Gheorghiu opened the 2012 Vienna Opera Ball. She sung "Habanera" (Carmen) and "I Could Have Danced All Night" (My Fair Lady) accompanied by Vienna Opera Orchestra conducted by Georges Pretre.