Complex sentence: On 27 May 1933, party membership was declared a basic requirement for public office; on 9 March 1937 it became mandatory if one wanted access to any public office and from 3 June 1938 those who did not join the party could not work.
Split into simpler sentences: On 27 May 1933, party membership was declared a basic requirement for public office. On 9 March 1937, it became mandatory if one wanted access to any public office and from 3 June 1938 those who did not join the party could not work.