Simplify the following text for a Grade 5 native English-speaking person.
Original: The ring system was definitively discovered on March 10 , 1977 by James L. Elliot , Edward W. Dunham , and Douglas J. Mink using the Kuiper Airborne Observatory .
Simplified: The rings of Uranus were discovered on March 10 , 1977 , by James L. Elliot , Edward W. Dunham , and Douglas J. Mink .