Simplify the following text for a Grade 11 native English-speaking person.
Original: With the USAF withdrawal from Rabat-Sal Ã in the 1960s , the facility became a primary facility for the Royal Moroccan Air Force known as Air Base NÂ 1 , a status it continues to hold .
Simplified: With the USAF leaving Rabat-Sal Ã in the 1960s , the facility became a primary facility for the Royal Moroccan Air Force known as Air Base NÂ 1 , a status it continues to hold .