Complex sentence: Plumbers use equipment that forces pressurised liquid CO 2 into a jacket around a pipe; the dry ice formed causes the water to freeze, forming an ice plug, allowing them to perform repairs without turning off the water mains.
Split into simpler sentences: Plumbers use equipment that forces pressurised liquid CO 2 into a jacket around a pipe. The dry ice formed causes the water to freeze, forming an ice plug, allowing them to perform repairs without turning off the water mains.