Complex sentence: After the war Reuther travelled to Germany and was instrumental in the re-organization of the German labor unions and through the remainder of his life was a strong supporter of the union movement in Germany and the rest of Europe.
Split into simpler sentences: After the war Reuther travelled to Germany and was instrumental in the re-organization of the German labor unions. Through the remainder of his life he continued to be a strong supporter of the union movement in Germany and the rest of Europe.