Original sentence: An institution that issues degrees without reputable accreditation may not be recognized as valid and is often referred to as a "diploma mill.The accreditation agencies rate universities and colleges on the basis of the quality of their libraries, the publishing records of their faculty, and the degrees which their faculty hold.Universities have evolved to form private accreditation agencies to vouch for the quality of the degrees they offer
Edited sentence: A degree without reputable accreditation might not be recognized as valid by outside parties, especially since the discovery of numerous "diploma mills.In light of the potential for self-governance to lead to lax standards, regional networks of universities have formed private accreditation agencies to vouch for the quality of their degrees.Regardless, each year the U.Secretary of Education publishes a list of accreditation agencies deemed reliable to judge educational standards.Since they judge the same entities that provide their funding, accreditation agencies have an inevitable conflict of interest