Complex sentence: Between Roche and St Columb Road stations, the line passes through Goss Moor nature reserve, where a low bridge carrying the railway over the A30 road had been the site of accidents when vehicles collided with it.
Split into simpler sentences: Between Roche and St Columb Road stations, the line passes through Goss Moor nature reserve. The low bridge over the A30 road had been the site of accidents when vehicles collided with it.