Complex sentence: Billie Joe Armstrong (born February 17,1972) is an American rock musician and occasional actor, best known as the lead vocalist, main songwriter, and guitarist for the American punk rock band Green Day, which he co-founded with Mike Dirnt.
Split into simpler sentences: Billie Joe Armstrong (born February 17,1972) is an American musician, singer, songwriter and occasional actor. He is best known as the lead vocalist, principal songwriter, and guitarist of the punk rock band Green Day, which Armstrong co-founded with Mike Dirnt.