Complex sentence: The opera occupied Janáček from 1908 until 1917 and the first performance took place at the National Theatre, Prague on April 23 1920, the only Janáček opera not premiered in Brno.
Split into simpler sentences: The opera occupied Janáček from 1908 until 1917. The first performance took place at the National Theatre, Prague on April 23 1920, the only Janáček opera not premiered in Brno.