Complex sentence: The band soon relocated to Sydney where Stu had previously met Guy Maddison of the Greenhouse Effect (now in Mudhoney) in Perth, Maddison now living in Sydney was offered the opportunity to play bass for Lubricated Goat.
Split into simpler sentences: The band soon relocated to Sydney, where Spasm ran into Guy Maddison of Perth band the Greenhouse Effect (now a member of Mudhoney). Maddison, who was now living in Sydney, was offered the opportunity to play bass for Lubricated Goat.