Complex sentence: In 1805, the construction of the Grand Junction Canal passed through the district to join the Regenet's Canal at Paddington, hence allowing passage traffic from the Midlands to London Docks, and hence onwards to the River Thames.
Split into simpler sentences: In 1805, the construction of the Grand Junction Canal passed through the district to join the Regent's Canal at Paddington. This allowed passage traffic from the Midlands to London Docks, and hence onwards to the River Thames.