Here "Jews" is a metonym for the "Jewish leaders" who opposed Jesus. Alternate translation: "Jewish leaders" (See: [[rc://en/ta/man/jit/figs-synecdoche]])
This is an idiom that means to experience death. The Jewish leaders mistakenly assume that Jesus is speaking only about physical death. Alternate translation: "die" (See: [[rc://en/ta/man/jit/figs-idiom]])