Vale was a pro wrestler who was 1-2 in real fights.
History lesson time-
Vale was a member of the Professional Wrestling Fujiwaragumi, a Japanese pro wrestling organization that emerged from the split of the UWF, the first org to promote shoot style worked matches. Fights were fake with the intention of looking real, forgoing tables, chairs, jumping off the top rope, etc, in favor of striking and grappling. By today's standards, it looks laughable and obviously fake to the eye used to Matt Hughes vs. George St. Pierre 3. In one of these fake fights, Vale "beat" Ken Shamrock by KO. Years later, Vale tried to advertise himself as the man who KOed Ken Shamrock (back when that mattered) before Ken threatened to sue for libel and challenged Vale to a legit MMA match. Vale backed off fast.
When the Professional Wrestling Fujiwaragumi began to hook up with regular pro wrestling orgs like Universal Lucha Libre, etc in preparation for cross-promotion with New Japan, one wrestler, Masakatsu Funaki basically said "Enough. You're full of crap Fujiwara, and I'm sick of faking fights." He and a lot of the newer, legitimate fighters such as Minoru Suzuki and Ken Shamrock went off to form Pancrase.
Bart Vale stayed loyal to Fujiwara while Funaki started an MMA career that still has people chanting his name. As a reward, Fujiwara gave Vale the Fujiwaragumi championship (Vale's supposed shootfighting heavyweight championship title). Vale, in America, began to take out ads for his style of fighting based on shoot style pro wrestling (Muay Thai and catch wrestling, not nearly as refined as Sayama's SHOOTO ciriculum or the divided striking/grappling training of Pancrase dojos and the famous Lion's Den where you would have a MT coach and a grappling coach, much like today.)
Afterwards, Vale's hype machine was set to get him booked into a fight with Renzo Gracie at the original MARS event before he pulled out (replaced with Oleg Taktarov)
Vale went 1-2 in pro fights. His first fight was a brutually ugly affair puncuated with headbutts. His second fight, against judo stylist Kazunari Murakami was an ugly, primitive affair where Murakami got behind Vale (after Vale attempted a straight armbar from the back that was obviously pro wrestling inspired) and TKOed the shootfighting champion. Vale's last fight was a total squash, a TKO loss at 36 seconds into Rd 2 against everyone's favorite Freddy Mercury impersonator, Dan "The Beast" Severn.
Vale was a big guy, and he had a decent marketing idea and the sense to trademark the term "shootfighting" when people assumed shootfighting = MMA. However, a legitimate fighter he was not. Vale, for lack of a better explanation, lied about his exploits, claimed pro wrestling was real, and hasn't trained anyone of note.