Complex sentence: His tenure saw the Suez Crisis, which led to the fall of the Eden government, but he continued to serve as Foreign Secretary under Harold Macmillan until 1960, then becoming Chancellor of the Exchequer (1960-1962).
Split into simpler sentences: His tenure saw the Suez Crisis, which led to the fall of the Eden government. He continued to serve as Foreign Secretary under Harold Macmillan until 1960, then becoming Chancellor of the Exchequer (1960-1962).