Complex sentence: The sonata in its original form was not published in Tchaikovsky's lifetime; it was published in 1900 by P. Jurgenson, and given the posthumous opus number 80.
Split into simpler sentences: The Sonata in its original form was not published in Tchaikovsky's lifetime. It was published in 1900 by P. Jurgenson, and given the posthumous opus number 80.