Complex sentence: Numerous studies have demonstrated improved patient health outcomes through environmental measures; exposing patients to nature has been shown to produce substantial alleviation of pain, and limited research also suggests that patients experience less pain when exposed to higher levels of daylight in their hospital rooms.
Split into simpler sentences: Numerous studies have demonstrated improved patient health outcomes through environmental measures. Exposing patients to nature has been shown to produce substantial alleviation of pain, and limited research also suggests that patients experience less pain when exposed to higher levels of daylight in their hospital rooms.