Complex sentence: State Shinto is also understood to refer to the state rituals and ideology of Emperor-worship, which was not a traditional emphasis of Shinto--of the 124 Japanese emperors, only 20 have dedicated shrines.
Split into simpler sentences: State Shinto is also understood to refer to the state rituals and ideology of Emperor-worship, which was never a traditional emphasis of Shinto. Of the 124 Japanese emperors, only 20 have dedicated shrines.