Simplify the following text for a Grade 9 native English-speaking person.
Original: Green Day 's three follow-up albums , Insomniac , Nimrod , and Warning did not achieve the massive success of Dookie , though they were still successful , reaching double platinum and gold status respectively .
Simplified: Green Day had three more albums after that , Insomniac , Nimrod and Warning . They were still successful albums , reaching double platinum , double platinum , and gold status respectively .