Complex sentence: After the war he returned to school, this time in Nottingham, England, and later to Cambridge, England to study art, at first full-time and later in the evenings between his employment in the Cambridge-area blood transfusion services.
Split into simpler sentences: After the war, he returned to school, this time in Nottingham, England. He later went to Cambridge, England to study art, at first full-time and later in the evenings between his employment in the Cambridge-area blood transfusion services.