Complex sentence: The original members are Jay Semko, Bryan Potvin, Merl Bryck and Glen Hollingshead who left the band in 1985, and was replaced by Don Schmid in June 1986.
Split into simpler sentences: The original members were Bryan Potvin, Jay Semko, Merl Bryck and Glen Hollingshead. Hollingshead left the band in 1985, and was replaced by Don Schmid in June 1986.