Complex sentence: Johan Birger Essen Dahlerus (6 February 1891--8 March 1957, Stockholm) was a Swedish businessman, amateur diplomat, and friend of Hermann Göring who tried through diplomatic channels to prevent the Second World War.
Split into simpler sentences: Johan Birger Essen Dahlerus (6 February 1891--8 March 1957, Stockholm) was a Swedish businessman, amateur diplomat and friend of Hermann Göring. He attempted through diplomatic channels to prevent the Second World War.