Original sentence: It was announced that Green Day will contribute a cover of John Lennon's "Working Class Hero" (originally appears on Lennon's 1970 album John Lennon/Plastic Ono Band) to the forthcoming CD Instant Karma: The Campaign To Save Darfur, proceeds from which help support Amnesty International's campaign to focus attention on the conflict in Darfur, Sudan
Edited sentence: It was announced that Green Day will contribute a cover of John Lennon's "Working Class Hero" (originally appears on Lennon's 1970 album John Lennon/Plastic Ono Band) to the forthcoming CD Instant Karma: The Campaign To Save Darfur, proceeds from which help support Amnesty International's campaign to focus attention on the urgent catastrophe in Darfur, Sudan