Complex sentence: Notodden is famous for the annual Notodden Blues Festival, which is considered one of the best blues festivals in Europe, but they also have a famous metal festival called "Motstøy Festivalen".
Split into simpler sentences: Notodden is famous for the annual Notodden Blues Festival, which is considered one of the best blues festivals in Europe. It also has a famous metal festival called "Motstøy Festivalen".