Complex sentence: The maintenance dredging operation consists of lowering the suction pipe onto the sea bed, and the dredge pumps are then engaged and the dredge is slowly moved along the path that needs to be deepened.
Split into simpler sentences: The maintenance dredging operation consists of lowering the suction pipe such that it touches the sea bed. The Dredge pumps are then operated and the dredger is slowly moved along the path, that needs to be deepened.