Zeev Sapir never forgot the promise Eichmann made in the Munkács ghetto or the call to justice by his fellow prisoner the moment before his execution. But many, many years would pass before he was brought forward to remember these things. What does brought forward mean in this context? Being ‘brought forward’ means being introduced, or presented to, again. So in the context of this paragraph, Zeev Sapir had an experience that made him remember the promise Eichmann once made. It means he was pushed to remember those things.