Complex sentence: In 1939 the couple went to England where she worked as language teacher at St Aldyn's College, before they emigrated in 1940 to the Dominican Republic, where they lived for 14 years.
Split into simpler sentences: In 1939 the couple went to England where she worked until 1940 as language teacher at St Aldyn's College. In 1940 they emigrated to the Dominican Republic, where they lived for 14 years.