Complex sentence: The Danzig Cross was instituted in 31 August 1939 as two grade decoration by Danzig Gauleiter Albert Forster, it's was awarded to those who contribute to building of the Nazi Party at the free city.
Split into simpler sentences: The Danzig Cross was instituted in 31 August 1939 as two grade decoration by Danzig Gauleiter Albert Forster. It was awarded to those who contribute to building of the Nazi Party at the free city.