Simplify the following text for a Grade 6 native English-speaking person.
Original: The line was reopened in late 2004 after 10 years of closure ( operating a Sunday and Bank Holiday service using a Class 117 diesel multiple unit ) , running between Ongar and Coopersale .
Simplified: The line was reopened in late 2004 after 10 years of being closed . It runs a Sunday and Bank Holiday service using a Class 117 diesel multiple unit .