Complex sentence: Hierl was already a high-ranking member of the NSDAP when the Party took power in January 1933, he remained the head of the labour organization-now called the "Nationalsozialistischer Arbeitsdienst", or NSAD.
Split into simpler sentences: Hierl was already a high-ranking member of the NSDAP when the Party took power in January 1933. He remained the head of the labour organization-now called the "Nationalsozialistischer Arbeitsdienst", or NSAD.