Complex sentence: Hitsuzendo refers specifically to a school of Japanese Zen calligraphy where the rating system of modern calligraphy (well-proportioned and pleasing to the eye) is foreign, more that the calligraphy of Hitsuzendo must breathe with the vitality of eternal experience.
Split into simpler sentences: Hitsuzendo refers specifically to a school of Japanese Zen calligraphy to which the rating system of modern calligraphy (well-proportioned and pleasing to the eye) is foreign. Instead, the calligraphy of Hitsuzendo must breathe with the vitality of eternal experience.