What is the most effective revision for the phrase: "but yet some people claim"?

The phrase "but yet some people claim" is redundant because both "but" and "yet" serve to introduce contrast. By choosing "but some people claim," the revision maintains the contrasting nature of the statement while eliminating unnecessary words, resulting in a more concise and clear expression. This revision effectively conveys the idea that there is a disagreement or a different viewpoint being presented without the clutter of redundant phrasing. Using "but" alone is sufficient to introduce contrast, making it the most effective option among the choices.