Complex sentence: In 1974, he formed progressive/rock group Armageddon-their self-titled debut, "Armageddon", was recorded in England and released in the United States on A&M Records.
Split into simpler sentences: In 1974, he formed progressive/rock group Armageddon. Their self-titled debut, "Armageddon", was recorded in England and released in the United States on A&M Records.