Simplify the following text for a Grade 7 native English-speaking person.
Original: Among the most famous mountain climbers in history , he was one of the first two individuals known to have reached the summit of Mount Everest , which he accomplished with Edmund Hillary on 29 May 1953 .
Simplified: Norgay and Sir Edmund Hillary were the first people to reach the top of Mount Everest on May 29 , 1953 .