Complex sentence: All the victims had been sacrificed by Adolfo de Jesus Constanzo and Sara Maria Aldrete, who were the High Priest and High Priestess of a religious cult known as Palo Mayombe, which was a form of an Afro-Caribbean cult known as Santeria.
Split into simpler sentences: All the victims had been sacrificed by Adolfo de Jesus Constanzo and Sara Maria Aldrete, respectively the High Priest and Priestess of a religious cult known as Palo Mayombe. At the time, Palo Mayombe was a form of a Afro-Caribbean cult known as Santeria.