Complex sentence: As the War of 1812 begun, Lowell and his family left Europe and on their way home, the boat and all their personal belongings were searched at the Halifax port to ensure that no manufacturing plans were being smuggled out of Great Britain.
Split into simpler sentences: As the War of 1812 begun, Lowell and his family left Europe. On their way home, the boat and all their personal belongings were searched at the Halifax port to ensure that no manufacturing plans were being smuggled out of Great Britain.