Complex sentence: He has also sang backing vocals on a live version of the Van Halen song "When It's Love" on Sammy Hagar's live album Hallelujia!, on which former Extreme bandmate Gary Cherone sang co-lead vocals with Sammy Hagar.
Split into simpler sentences: He has also sang backing vocals on a live version of the Van Halen song "When It's Love" on Sammy Hagar's live album Live! Hallelujah, on which former Extreme bandmate Gary Cherone sang co-lead vocals with Sammy Hagar.