Complex sentence: Some types of capacitors have their internal arcing vaporizing parts of the electrodes around the failed spot to self-heal; others form a conductive pathway through the dielectric, leading to shorting or partial loss of dielectric resistance.
Split into simpler sentences: Some types of capacitors "self-heal", as internal arcing vaporizes parts of the electrodes around the failed spot. Others form a conductive pathway through the dielectric, leading to shorting or partial loss of dielectric resistance.