Complex sentence: The baths have the popular reputation of being Roman in origin, though Roman London lay far to the east; the visible remains, which lie below the modern street level, date from a 17th-century refurbishment.
Split into simpler sentences: The baths have a historical reputation of being Roman in origin, though Roman London lay to the east. The visible remains, which lie below the modern street level, date from a 17th-century refurbishment.