Complex sentence: She returned to Coventry and from January to April 1960 taught general subjects in a primary school there, then to London where from May to October she was an assistant in the promotion department of music publishers Boosey & Hawkes.
Split into simpler sentences: She returned to Coventry and from January to April 1960 taught general subjects in a primary school there. Then she went to London where from May to October she was an assistant in the promotion department of music publishers Boosey & Hawkes.