Original sentence: The Chemtrail conspiracy theory claims that some trails left behind jet aircraft are different in appearance and quality from those of normal contrails, may be composed of harmful chemicals, and that these different contrails are being deliberately produced, and covered up by the government.The belief is that a chemical and/or biological agent of some sort is being released
Edited sentence: Many people have raised claims that belief is that chemical and/or biological agent of some sort are being released, and are associated with respiratory, skin and neurological abnormalities.The Chemtrail conspiracy theory is a term that attempts to discredit claims that some trails left behind jet aircraft are different in appearance and quality from those of normal contrails, may be composed of harmful chemicals, and that these different contrails are being deliberately produced, and covered up by the government