Complex sentence: He was not nominated for a second term, but when his replacement, B. H. Roberts, was denied his seat because he was a polygamist, King was elected to complete Roberts' term and served from April 2,1900 to March 3,1901.
Split into simpler sentences: He was not nominated for a second term, but when his replacement, B. H. Roberts, was denied his seat because he was a polygamist, King was elected to complete Roberts' term. He served from April 2,1900 to March 3,1901.