Complex sentence: He was an alderman and, at one time, was mayor of Hampstead and in the 1957 Birthday Honours he was made an Officer of the Order of the British Empire (OBE), "for public services in Hampstead".
Split into simpler sentences: He was an alderman and, at one time, was mayor of Hampstead. In the 1957 Birthday Honours he was made an Officer of the Order of the British Empire (OBE), "for public services in Hampstead".