Complex sentence: The county was originally named after William Cabell Rives (1793-1868), who served as U. S. senator from Virginia, 1833-1845, he lost popularity in Missouri after joining the Whig Party.
Split into simpler sentences: The county was originally named after William Cabell Rives (1793-1868), who served as U. S. senator from Virginia, 1833-1845. However, he lost popularity in Missouri after joining the Whig Party.