Complex sentence: As a second lieutenant, he fought so courageously during the German counter-offensive in Alsace that he won the Croix de Guerre and Bronze Star and was given the rank of Chevalier in the Legion of Honor.
Split into simpler sentences: As a second lieutenant, he fought during the German counter-offensive in Alsace. He won the Croix de Guerre and Bronze Star and was given the rank of Chevalier in the Legion of Honor.