Complex sentence: In 1972 bisexual activist Don Fass founded the National Bisexual Liberation group in New York City, which issued "The Bisexual Expression", most likely the earliest bisexual newsletter.
Split into simpler sentences: In 1972 bisexual activist Don Fass founded the National Bisexual Liberation group in New York City. It issued the newsletter "The Bisexual Expression", which is most likely the earliest bisexual newsletter.