Complex sentence: He listened to 257 names of objects and recalled them in the same sequence, but before sending the evidence to The Guinness World Records authorities, another person broke Rajus' record by memorizing 470 objects.
Split into simpler sentences: He listened to 257 names of objects and recalled them in same sequence. But before sending the evidences to The Guinness World Records authorities, some other person broke the past record by memorizing 470 objects.