Complex sentence: The Hospital Termal Rainha D. Leonor (Queen Leonor Spring Water Hospital, or Thermal Hospital), a medical spa offering physician-prescribed sulphur-water treatment managed by "CHO", is the world's oldest purpose-built thermal medical institution.
Split into simpler sentences: The Hospital Termal Rainha D. Leonor (Queen Leonor Spring Water Hospital, or Thermal Hospital), a medical spa offering physician-prescribed treatment in sulphurous waters, is managed by. The hospital is the world's oldest purpose-built thermal medical institution.