Complex sentence: Following the failure of the Free Soil Party in the election that year, most Conscience Whigs returned to the Whig fold and more followed after the Compromise of 1850 temporarily neutralized the issue of slavery.
Split into simpler sentences: Following the failure of the Free Soil Party in the election that year, most Conscience Whigs returned to the Whig fold. More followed after the Compromise of 1850 temporarily neutralized the issue of slavery.