Complex sentence: Then in 1940 the Association of Women Clerks and Secretaries transferred to NUCAW and the union was renamed the Clerical and Administrative Workers Union and changed its name to the Association of Professional, Executive, Clerical and Computer Staff (APEX) in 1972.
Split into simpler sentences: Then in 1940 the Association of Women Clerks and Secretaries transferred to NUCAW and the union was renamed the Clerical and Administrative Workers Union. It changed its name to the Association of Professional, Executive, Clerical and Computer Staff (APEX) in 1972.