Complex sentence: After a year's service Neumann returned to Germany at the rank of Oberleutnant with two victories and the Spanish Cross in Gold with Swords, and was then appointed Gruppenkommandeure (Squadron leader) with the 4.
Split into simpler sentences: After a year's service Neumann returned to Germany at the rank of Oberleutnant with two victories and the Spanish Cross in Gold with Swords. He was appointed Gruppenkommandeure (Squadron leader) with the 4.