Complex sentence: Wilhelm Fritz von Roettig was a general in the Waffen-SS who participated in the invasion of Poland who carries the dubious distinction of being the first general to have been killed in World War II. He held the ranks of Generalmajor der Ordnungspolizei and SS Brigadeführer.
Split into simpler sentences: Wilhelm Fritz von Roettig was a general in the Waffen-SS who participated in the invasion of Poland. He carries the dubious distinction of being the first general to have been killed in World War II. Von Roettig held the ranks of Generalmajor der Ordnungspolizei and SS Brigadeführer.