They were used in the Roman Baths.
bath() and Bath in English sounds exactly the same that*s why the city got this name
предложения данные в задании неполные- трудно понять о чем идет речь
Надо добавить подлежащее, скорее всего They were used in the Roman Baths. Bath in English sounds exactly and explains (или that's) why city got its name.