Complex sentence: A veteran of the U.S. Civil War, where he fought for the 12th Maine Regiment against the Confederates in Louisiana, he was hired by the Japanese government as a foreign adviser to assist in the modernization of the Japanese education system after the Meiji Restoration.
Split into simpler sentences: A veteran of the U.S. Civil War, where he fought for the 12th Maine Regiment against the Confederates in Louisiana. After the war, he was hired by the Japanese government as a foreign adviser to assist in the modernization of the Japanese education system after the Meiji Restoration.