Complex sentence: In 1983 he was called to the Presidency of the Seventy and on October 1,1988, he was called to serve in the Quorum of the Twelve Apostles, filling the vacancy created by the death of quorum president Marion G. Romney.
Split into simpler sentences: In 1983 he was called to the Presidency of the Seventy. On October 1,1988, he was called to serve in the Quorum of the Twelve Apostles, filling the vacancy created by the death of quorum president Marion G. Romney.