Complex sentence: The piece was written in 1943, the score being inscribed "15 August-8 October 1943", and it premiered on December 1,1944 in Boston Symphony Hall by the Boston Symphony Orchestra conducted by Serge Koussevitzky.
Split into simpler sentences: The piece was written in 1943, the score being inscribed "15 August-8 October 1943". It was premiered on December 1,1944, in Boston Symphony Hall by the Boston Symphony Orchestra conducted by Serge Koussevitzky.