Complex sentence: His last noteworthy appearance came in February 1933 at a concert marking the fiftieth anniversary of Richard Wagner's death, given in Leipzig with Hitler in attendance; his final concert was on May 19,1933 with the Hamburg Philharmonic.
Split into simpler sentences: His last noteworthy appearance came in February 1933 at a concert marking the fiftieth anniversary of Wagner's death, given in Leipzig with Hitler in attendance. His final concert was on May 19,1933, with the Hamburg Philharmonic.