Complex sentence: Smith practiced plural marriage, and was the father of 19 children, one of whom was George Albert Smith, who also became an LDS Apostle and went on to serve as the 8th President of the Church.
Split into simpler sentences: Smith practiced plural marriage, and was the father of 19 children. One was George Albert Smith, who also became an LDS Apostle and went on to serve as the 8th President of the Church.