Complex sentence: In 1978 he published this material in his groundbreaking book "Witchcraft and the Gay Counterculture", which analyzed evidence that many people accused of "witchcraft" and "heresy" during the Middle Ages and the Renaissance were persecuted for their sexuality and ancient pagan practices.
Split into simpler sentences: In 1978 he published this material in his groundbreaking book "Witchcraft and the Gay Counterculture". The book offered evidence that many of the people accused of "witchcraft" and "heresy" in the Middle Ages and the Renaissance were actually persecuted because of their sexuality and ancient pagan practices.