Complex sentence: Cockcroft-Walton circuits are still used in particle accelerators, but now also in many everyday electronic devices that require high voltages, such as x-ray machines, television sets, and photocopiers.
Split into simpler sentences: Cockcroft-Walton circuits are still used in particle accelerators. They also are used in day today electronic devices that require high voltages, such as x-ray machines, television sets, and photocopiers.