Complex sentence: Among those who practice "magic" are Wiccans, those who identify as Neopagan Witches, and practitioners of some forms of revivalist Neo-druidism, the rituals of which are at least partially based upon those of ceremonial magic and freemasonry.
Split into simpler sentences: Among those who practice "magic" are Wiccans, those who identify as Neopagan Witches, and practitioners of some forms of revivalist Neo-druidism. The rituals of whom are at least partially based upon those of ceremonial magic and freemasonry.