Complex sentence: Kennedy was close to 10 years old when his uncle Jack was shot while in the White House as President and he was 14 years old when his father was assassinated while running for President in the 1968 election.
Split into simpler sentences: Kennedy was close to 10 years old when his uncle Jack was shot while in the White House as President. He was 14 years old when his father was assassinated while running for President in the 1968 election.