Complex sentence: Eirik Hundvin (also known as Pytten) is a producer and recording engineer for many classic black metal albums, mainly by Norwegian bands, nearly all of which were recorded in the Grieg Hall in Bergen.
Split into simpler sentences: Eirik Hundvin (also known as Pytten) is a producer and recording engineer for many classic black metal albums, mainly by Norwegian bands. Nearly all of which were recorded in the Grieg Hall in Bergen.