Complex sentence: Gary Stallions also played second guitar for an appearance at a Redwood High School talent show, which they were kicked out of, when panic ensued because no one other than the punk scene knew what was going on when the fast music & slam dancing erupted.
Split into simpler sentences: Gary Stallions also played second guitar for an appearance at a Redwood High School talent show. They were kicked out of the talent show when panic ensued because no one other than the punk scene knew what was going on when the fast music & slam dancing erupted.