Original: Merry and Pippin rejoin the others and Pippin looks into a palantÃ r , a seeing-stone that Sauron had used to communicate with Saruman , unknowingly leading Sauron to think that Saruman has captured the Ring-bearer , so Gandalf takes Pippin to Gondor .
Simplified: Pippin steals the palantÃ r and looks in , and because of this is discovered by Sauron .