Complex sentence: The Taw Vale Extension Railway completed construction of its line on the broad gauge and on 1st August 1851 it opened its line from Crediton to Barnstaple, and it changed its name to the North Devon Railway, also completing and taking over the original Taw Vale.
Split into simpler sentences: The Taw Vale Extension Railway completed construction of its line on the broad gauge and on 1 August 1851 it opened its line from Crediton to Barnstaple. It also changed its name to the North Devon Railway and completed the take over of the original Taw Vale.