Complex sentence: When Virginie died, Charles and his wife moved to New Orleans and Parlange was left to tenants for the next 20 years until Charles' son, Walter, left New Orleans to return and take up the life of a plantation farmer.
Split into simpler sentences: When Virginie died, Charles and his wife moved to New Orleans. They leased Parlange to tenants for the next 20 years until Charles' son, Walter, left New Orleans to return and take up the life of a plantation farmer.