Complex sentence: Cramer's name was added to "The Wall" in November, 1983, after successful efforts by Captain Cramer's son, Lt. Col. Harry G. Cramer III USAR, then an active duty Army officer, to get DoD to acknowledge his father's death.
Split into simpler sentences: Cramer's name was added to "The Wall" in November, 1983. This was after successful efforts by Captain Cramer's son, Lt. Col. Harry G. Cramer III USAR, then an active duty Army officer, to get the Department of Defense to acknowledge his father's death.