Complex sentence: His Symphony No.1 was premiered by the Florida Symphony under conductor Kenneth Jean, and other orchestral music has been premiered by the Seattle Symphony, Northwest Symphony Orchestra, and Music Today in New York under the direction of Gerard Schwarz.
Split into simpler sentences: His Symphony No.1 was premiered by the Florida Symphony under conductor Kenneth Jean. Other orchestral music has been premiered by the Seattle Symphony, Northwest Symphony Orchestra, and Music Today in New York under the direction of Gerard Schwarz.