Complex sentence: A number of Brahma Kumari splinter groups exist, one documented by Dr. John Walliss, is the Advance Party, Shankar Party or AIVV to the BKWSU.
Split into simpler sentences: A number of Brahma Kumari splinter groups exist. One documented by Dr. John Walliss, is the Advance Party, Shankar Party or AIVV to the BKWSU.