To add to what hokoton_punch says, I think "Generation of Maten & Muten & Seiten Sanzos before Tenkai & Goudai & Koumyou (Saiyuki Ibun)" is as clear as it can be (names rearranged simply to have them in order of their titles). We're only ever given information on one particular Uten sanzo (the one murdered in a desert) so I'm not sure if he needs to be clarified for people who know the canon, but "The Uten Sanzo who died/was killed in the desert (Saiyuki)" would indeed make it clear who was meant.