Final answer:
The medieval form of the ritual of adult baptism was greatly simplified and shortened in the RCIA.
Step-by-step explanation:
The statement is True. The ritual for adult baptism in the RCIA (Rite of Christian Initiation of Adults) did indeed greatly simplify and shorten the medieval form of the ritual. In the medieval period, baptism was a complex and lengthy process, but the RCIA has streamlined and simplified it for adult converts to the Catholic faith.