Complex sentence: She served in Iwo Jima from June 1944 until the end of the war, when the ship was ordered to return to the United States, arriving at Norfolk in November 1945.
Split into simpler sentences: She served in Iwo Jima from June 1944 until the end of the war. With the War's end, "Downes" was ordered to return to the United States and arrived at Norfolk in November 1945.