Complex sentence: Piper responded to increasing ADL criticism through his 2006 book "The Judas Goat", accusing the ADL of using unethical infiltration and information gathering techniques, such as the use of'agents provocateurs'.
Split into simpler sentences: Piper responded to increasing ADL criticism through his 2006 book "The Judas Goat". It accuses the ADL of using unethical infiltration and information gathering techniques, such as the use of'agents provocateurs'.