Complex sentence: They believed that the alcohol trade led to innumerable social conflicts, "murders, violations, and monstrous unheard-of crimes" to the point that many native groups also wanted the trade stopped, p140.
Split into simpler sentences: They believed that the alcohol trade led to innumerable social conflicts, "murders, violations, and monstrous unheard-of crimes". To the point that many native groups also wanted the trade stopped, p140.