Original sentence: Although supporters point to the anecdotal evidence of thousands of positive testimonials as a reason to use it for personality evaluation, most empirical studies fail to show the validity claimed by its supporters.Graphology is the pseudoscientific study and analysis of handwriting especially in relation to human psychology
Edited sentence: Although supporters point to the anecdotal evidence of thousands of positive testimonials and the many empirical studies  that show its scientific validity and utility, most empirical studies fail to show the validity claimed by its supporters.Graphology is the study and analysis of handwriting especially in relation to human psychology