Complex sentence: Before 1832, most of Smith's revelations dealt with establishing the church, gathering his followers, and building the City of Zion, while later revelations dealt with the priesthood, endowment, and exaltation.
Split into simpler sentences: Before 1832, most of Smith's revelations dealt with establishing the church, gathering his followers, and building the City of Zion. Later revelations dealt primarily with the priesthood, endowment, and exaltation.