Original sentence: Decker distinguished themselves multiple times, for instance at Shisdra, in the relief of the cauldron of Kowel and at Operation Zitadelle and was promoted to Generalmajor on 1 December 1943
Edited sentence: Decker distinguished himselves multiple times, for instance at Shisdra, in the relief of the cauldron of Kowel and at Operation Zitadelle and was promoted to Generalmajor on 1 December 1943