Complex sentence: He joined the Reichswehr, then the Labour Service (Arbeitsdienst) and in 1937, he volunteered to join the SS-VT and took part in the Anschluss of Austria and the annexation of the Sudetenland in 1938.
Split into simpler sentences: He joined the Reichswehr, then the Labour Service (Arbeitsdienst) and in 1937, he volunteered to join the SS-VT. He took part in the Anschluss of Austria and the annexation of the Sudetenland in 1938.