Complex sentence: At the 1992 US vice presidential debate during his opening statement, Democratic nominee Al Gore took a humorous shot at Dan Quayle over the Jack Kennedy comparison, who was running for re-election and trying to make up for his performance in the 1988 debate.
Split into simpler sentences: At the 1992 US vice presidential debate during his opening statement, Democratic nominee Al Gore took a humorous shot at Dan Quayle over the Jack Kennedy comparison. Quayle was running for re-election and trying to make up for his performance in the 1988 debate.