Complex sentence: This believer's baptism as opposed to baptism of infants, who did not make the decision to be baptized nor even know what is going on and are in a traditional line with early Anabaptists of the 16th century.
Split into simpler sentences: This believer's baptism is opposed to baptism of infants, who did not make the decision to be baptized nor even know what is going on. Anabaptists are those who are in a traditional line with the early Anabaptists of the 16th century.