Simplify the following text for a Grade 6 native English-speaking person.
Original: She could have gone if she had won a medal at the World Junior Championships , but that was the last year the World Junior Championships were held before Nationals and Nam did not go to those championships .
Simplified: Nam could not get this exemption because she had not competed at the 1999 World Junior Championships . 1999 was the last year that the U.S. Figure Skating Championships were held after the World Junior Championships .