Complex sentence: Compilation on the Negro in Mormonism, p.40 When Smith ran for president of the United States, the anti-slavery plank of his platform called for a gradual end to slavery by the year 1850.
Split into simpler sentences: Compilation on the Negro in Mormonism, p.40 Smith ran for president of the United States. The anti-slavery plank of his platform called for a gradual end to slavery by the year 1850.