Complex sentence: During the Mexican-American War, Houghton enlisted in the First Regiment, New York Volunteers, in June 1846 and was honorably discharged at Monterey, California, in October 1848.
Split into simpler sentences: During the Mexican-American War, Houghton enlisted in the First Regiment, New York Volunteers, in June 1846. He was honorably discharged at Monterey, California, in October 1848.