Complex sentence: Allegations were brought forth by Catholic supporters claiming that he was the mastermind of a plan by the communists to discredit the friars, who were not only called "victims", but even "saints".
Split into simpler sentences: Allegations were brought forth by catholic supporters that he was the mastermind of a plan by the communists do discredit the friars. The friars were not only called "victims", but even "saints".