Simplify the following text for a Grade 4 native English-speaking person.
Original: Only in 1965 it was found and became widely known that Pico da Neblina was the country 's highest mountain . Pico da Bandeira remains the highest Brazilian mountain outside of the Amazon region , and the third highest overall , after Pico da Neblina and 31 de MarÃ o.
Simplified: Pico da Neblina is Brazil 's highest mountain .