Complex sentence: After the results Kennedy declared that McCarthy and Kennedy, both anti-war, had managed to earn over 80 percent of the vote, "a smashing repudiation" of the Johnson-Humphrey administration.
Split into simpler sentences: After the results Kennedy declared that he McCarthy, both anti-war candidates, had managed to earn over 80 percent of the vote collectively. He described this as "a smashing repudiation" of the Johnson-Humphrey administration.