Complex sentence: Baron Roman Romanovitch Rosen (February 24,1847--January 22,1922) was the Russian ambassador to Japan and the United States during the Russo-Japanese War.
Split into simpler sentences: Baron Roman Romanovitch Rosen (February 24,1847--January 22,1922) was a Russian diplomat. He served as the Russian ambassador to Japan and the United States during the Russo-Japanese War.