Complex sentence: During the Russo-Japanese War he participated in the siege of Port Arthur, where he lost his left arm and was captured, subsequently receiving four decorations for bravery, which made him the most decorated Jewish soldier in Russia.
Split into simpler sentences: During the Russo-Japanese War, he participated in the siege of Port Arthur, where he lost his left arm and was captured. He subsequently received four decorations for bravery, which made him the most decorated Jewish soldier in Russia.