Complex sentence: The first one were at Besta Útihátiðin 2011 at Gallstaðalækur, Hella, the other two were at NASA, a nightclub downtown Reykjavík.
Split into simpler sentences: The first one were at Besta Útihátiðin 2011 at Gallstaðalækur, Hella. And the other two were at NASA, a nightclub downtown Reykjavík.