Complex sentence: A water rite is a rite or ceremonial custom in which water is used as the central religious feature, in which a person is immersed or bathed as a symbol of religious indoctrination "or" ritual purification.
Split into simpler sentences: A water rite is a rite or ceremonial custom that uses water as the central feature. Typically, a person is immersed or bathed as a symbol of religious indoctrination "or" ritual purification.