Complex sentence: From 1951 to 1953, she was classics mistress of Francis Holland School and in 1962 travelled with her husband to his post in Washington D.C., where she was Latin teacher at National Cathedral School.
Split into simpler sentences: From 1951 to 1953, she was taught classics at Francis Holland School. In 1962 she travelled with her husband to his post in Washington D.C., where she taught Latin at the National Cathedral School.