Complex sentence: Tchaikovsky biographer and musicologist John Warrack reminds us that Tchaikovsky had already composed a piano-and-orchestra work in less than three movements--the "Concert Fantasia" he had played in Paris with Diémer was conceived as a two-movement work.
Split into simpler sentences: Tchaikovsky biographer and musicologist John Warrack reminds us that Tchaikovsky had already composed a piano-and-orchestra work in less than three movements. The "Concert Fantasia" the composer had played in Paris with Diémer was conceived as a two-movement work.