If the profile has become such a mish-mash that nothing on it is of value, you have at least a couple of options to consider.
First, if this conflation is commonly found in the world of internet genealogy, the best thing may be to leave the profile as is but start it through the Disproven Existence process (I added that tag to your question). That will ultimately show that the person did not exist yet leave the profile in place so it and the problem are not recreated anew.
Second, if you can ascertain which parts of the profile would be valid for a single individual, you can remove the other data and then attempt to merge it into an existing profile that the remaining data points support.