What Sasuke founds out from madara?

Answer 1

He finds out that Itachi was forced to kill his clan or war would come to the leaf village and that he loved his baby brother (Sasuke) to much that he cant bring himself to kill him then he went begging the third hokage to keep Sasuke safe and not let him know that he was forced to kill the clan so he keeps thinking his clan was a proud clan later he threatened the elders if they try to hurt Sasuke he would come and kill them all and when the third died he went back to the leaf to tell the elders he was alive and when Itachi almost died he gave Sasuke new powers so he could stay safe

hope I helped.