Complex sentence: By comparison, a shipment of canoes, which were not packaged for shipment, would be light but would take up a large volume, ensuring the customary freight unit would be the measurement ton of 100 cubic feet.
Split into simpler sentences: By comparison, a shipment of canoes, which were not packaged for shipment, would be light but would take up a large volume. Hence the customary freight unit would be the measurement ton of 100 cubic feet.