Simplify the following text for a Grade 9 native English-speaking person.
Original: The NBC Symphony performed weekly radio concert broadcasts with Toscanini and other conductors and served as house orchestra for the network , beginning November 13 , 1937 and continuing until 1954 .
Simplified: The NBC Symphony performed weekly radio concert broadcasts with Toscanini and other conductors and served as house orchestra for the network . It began November 13 , 1937 .