Complex sentence: Most of the buildings have features reflecting their use as cure cottages by residents suffering from tuberculosis, especially the "cure porches" where patients were exposed daily, year round, to as much fresh air as possible.
Split into simpler sentences: Most of the buildings have features reflecting their use as cure cottages by residents suffering from tuberculosis. Patients sat out on the "cure porches" in order to be exposed daily, year round, to as much fresh air as possible.