Simplify the following text for a Grade 11 native English-speaking person.
Original: He studied mathematics and science at the University of Auckland , and in 1939 completed his first major climb , reaching the summit of Mount Ollivier , near Aoraki\/Mount Cook in the Southern Alps .
Simplified: He learned about mathematics and science at The University of Auckland , and in 1939 he completed his first important climb , which was reaching the top of a mountain called Mount Ollivier .