Complex sentence: Oral tradition is the source for the two apparitions of the Blessed Mother of Velankanni in the 16th century and the saving of the Portuguese sailors from a tempest in the Bay of Bengal in the later 17th century.
Split into simpler sentences: Oral tradition is the source for the two apparitions of the Blessed Mother of Velankanni in the 16th century. The saving of the Portuguese sailors from a tempest in the Bay of Bengal in the later 17th century.