Complex sentence: Then, from 1962 to 1964, Léger held the commission of Ambassador to Italy, from 1964 to 1968 was the Ambassador to France, and briefly served as Ambassador to Belgium and Luxembourg between March 1973 and January 1974.
Split into simpler sentences: Then, from 1962 to 1964, Léger held the commission of Ambassador to Italy, and, from 1964 to 1968 was the Ambassador to France. Léger left that position in 1972, and briefly served as Ambassador to Belgium and Luxembourg between March 1973 and January 1974.