Complex sentence: Around 1810 the Kennet and Avon Canal was built through the gardens and then in 1840 the route of the Great Western Railway also cut through the area, with the loss of several of the original buildings.
Split into simpler sentences: Around 1810 the Kennet and Avon Canal was built through the gardens. In 1840 the route of the Great Western Railway also cut through the area, with the loss of several of the original buildings.