Complex sentence: He failed to be reflected in 1818 to the Sixteenth Congress, and again in 1820 and 1822 to the Seventeenth and Eighteenth Congresses, respectively.
Split into simpler sentences: He failed to be re-elected in 1818 to the Sixteenth Congress. He was also an unsuccessful canidate for congress in the 1820 and 1822 to the Seventeenth and Eighteenth Congresses, respectively.