Simplify the following text for a Grade 9 native English-speaking person.
Original: The most high profile concert held at Maine Road was that of Mancunian band Oasis ( themselves avowed Manchester City fans ) in April 1996 , a performance which was later released as a video , â There and Then .
Simplified: The most high profile concert held at Maine Road was that of Mancunian band Oasis ( themselves avowed Manchester City fans ) in April 1996 , a performance which was later released as a video , Oasis : ... There and Then .