Complex sentence: In addition to the Knight's Cross of the Iron Cross, Phleps was awarded the German Cross in Gold, and after he was killed in September 1944, he was awarded the Oak Leaves to his Knight's Cross.
Split into simpler sentences: In addition to the Knight's Cross of the Iron Cross, Phleps was awarded the German Cross in Gold, and after he was killed in September 1944. He was awarded the Oak Leaves to his Knight's Cross.