Complex sentence: Peter Carter trained for six years as a psychiatric nurse at Hill End Hospital in St Albans, then worked at the then regional adolescent unit at Hill End Hospital, undertaking further training in family therapy and crisis intervention.
Split into simpler sentences: Peter Carter trained for six years as a psychiatric nurse at Hill End Hospital in St Albans. He moved on to work at the then regional adolescent unit at Hill End Hospital where he undertook further training in family therapy and crisis intervention.