Complex sentence: After the show, DeFarfalla left Opeth to spend time with his girlfriend, and was replaced by Åkerfeldt's friend, Peter Lindgren, who was playing in a joke band called Sylt i krysset.
Split into simpler sentences: After the show, DeFarfalla left Opeth to spend time with his girlfriend. He was replaced by Åkerfeldt's friend Peter Lindgren, who was playing in a joke band called Sylt i krysset.