Complex sentence: Utah's senators are elected in the years from classes I and III. Senators were originally chosen by the Utah House of Representatives until the Seventeenth Amendment came into force in 1913, which called for direct elections of senators to by statewide popular vote.
Split into simpler sentences: Utah's senators are elected in the years from classes I and III. Senators were originally chosen by the Utah House of Representatives until the Seventeenth Amendment came into force in 1913. The Seventeenth Amendment allowed for direct elections of senators to by statewide popular vote.