Complex sentence: Born in New York City, Barry was stationed near the Canadian border as a lieutenant of artillery upon his graduation from West Point and later took part in the Mexican-American, Seminole and the Kansas-Missouri Border Wars.
Split into simpler sentences: Born in New York City, Barry was stationed near the Canadian border as a lieutenant of artillery upon his graduation from West Point. He later took part in the Mexican-American, Seminole and the Kansas-Missouri Border Wars.