Complex sentence: When he was six years old, his family moved to Hawaii, where his maternal grandparents had lived since 1959 and his grandfather worked as a shipfitter at Naval Station Pearl Harbor for over 30 years.
Split into simpler sentences: When he was six years old, his family moved to Hawaii, where his maternal grandparents had lived since 1959. His grandfather worked as a shipfitter at Naval Station Pearl Harbor for over 30 years.