Complex sentence: In 1842-3 a schism developed in the Society of Friends in Salum in Iowa over the ways that the society should support slavery, which was still an important part of the American economy.
Split into simpler sentences: In 1842-3 a schism developed in the Society of Friends in Salum in Iowa. The difference developed over the ways that the society should support slavery, which was still an important part of the American economy.