Complex sentence: As a part of her doctorate work, she did field research in Malabar district from 1947 to 1949, Tanjore district from 1950 to 1953 and Vietnam in the 1960s and 1970s.
Split into simpler sentences: As a part of her doctorate work, she did field research in Malabar district from 1947 to 1949. She did further research in Tanjore district from 1950 to 1953 and Vietnam in the 1960s and 1970s.