Complex sentence: In Pipe jacking hydraulic jacks are used to push specially made pipes through the ground behind a TBM or shield, commonly used to create tunnels under existing structures, such as roads or railways.
Split into simpler sentences: In pipe jacking, hydraulic jacks are used to push specially-made pipes through the ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways.