Original sentence: A number of controversies or alternative theories have emerged concerning the September 11, 2001 attacks.Since the attacks, a variety of theories have been alleged that people other than, or in addition to, al-Qaida were responsible, including the U
Edited sentence: A number of conspiracy theories have emerged concerning the September 11, 2001 attacks.Since the attacks, a variety of conspiracy theories abound suggesting actors other than al-Qaida were responsible, including the U