Original sentence: According to dictionaries, a conspiracy theory is a theory involving a plot by a group of individuals who conspired'' to be responsible for an event or series of events.Colloquially, a conspiracy theory''' is any unconventional theory about current or historical events, with the connotation that that theory is unfounded, outlandish, or irrational or in some way unworthy of serious consideration.This theory is opposed by other theories that the same events can be explained as an accident or by the responsibility of a single individual
Edited sentence: Colloquially, a conspiracy theory is any unconventional theory about current or historical events, with the connotation that that theory is unfounded, outlandish, or irrational or in some way unworthy of serious consideration