Complex sentence: From 1957 to 1961 Boyson was a Labour councillor in Haslingden, where his father was at that time a Labour alderman and had been a trade union secretary-he was a cotton spinner; in the First World War he had been imprisoned as a conscientious objector.
Split into simpler sentences: From 1957 to 1961 Boyson was a Labour councillor in Haslingden, where his father was at that time a Labour alderman and had been a trade union secretary. His father was a cotton spinner, and in the First World War he had been imprisoned as a conscientious objector.