Complex sentence: In 1997 Spiral Tribe toured America with a full rig and crew, joining forces once again with stateside free party systems and were instrumental in the initiation of the Autonomous Mutant Festival in July of that year.
Split into simpler sentences: In 1997 Spiral Tribe toured America with a full rig and crew, joining forces once again with free party systems. They were instrumental in the initiation of the Autonomous Mutant Festival in July of that year.