Complex sentence: By the end of World War II, it had become a rarity, though it continued to be worn daily for formal wear, such as in London at various positions in the Bank of England and City stockbroking, or boys at some public schools.
Split into simpler sentences: By the end of World War II, it had become a comparative rarity, though it continued to be worn regularly in certain roles. In Britain these included holders of various positions in the Bank of England and City stockbroking, and boys at some public schools.