Complex sentence: Shinto is considered to be at the fountain-head of Japanese culture and, with its emphasis on the wholeness of nature and character in ethics, and its celebration of the landscape, it sets the tone for Japanese aesthetics.
Split into simpler sentences: Shinto is considered to be at the fountain-head of Japanese culture. With its emphasis on the wholeness of nature and character in ethics, and its celebration of the landscape, it sets the tone for Japanese aesthetics.