Complex sentence: She decided that brothers Arie and Bill Wilgenburg were not acting maliciously when they instructed workers to toss the hens into the wood chippers in 2003, as they had followed the advice of two veterinarians to euthanize the diseased chickens.
Split into simpler sentences: She decided that brothers Arie and Bill Wilgenburg were not acting maliciously when they instructed workers to toss the hens into the wood chippers in 2003. They had followed the advice of two veterinarians to euthanize the diseased chickens.