Complex sentence: Two days after RFK announced his candidacy, Vice President Humphrey said Kennedy was a supporter of the administration's policies on the Vietnam conflict during the JFK presidency and his office produced a statement of Kennedy from six years prior saying the US would win in Vietnam.
Split into simpler sentences: Two days after RFK announced his candidacy, Vice President Humphrey saidthat RFK had supported the JFK administration's policies on the Vietnam conflict. Humphrey's office produced a statement from Kennedy, written six years prior, saying the US would win in Vietnam.