Complex sentence: He has researched the NBA's draft history from 1950 to present day and cleared many conflicting data reports; as simple as what college a player last played, to unknown truths about the order players were selected in the earliest drafts where information is sketchy at best.
Split into simpler sentences: He has researched the NBA's draft history from 1950 to present day. His research has cleared many conflicting data as simple as what college a player last played to unkown truths as what order players went in the earlier draft where information is sketchy at best.