Complex sentence: The high concentration of energy in a small volume of matter which can be reached in this way results in very fast increase of temperature in the spot of impact causing the melting or even evaporation of any material, depending on working conditions.
Split into simpler sentences: The high concentration of energy in a small volume of matter can be reached in this way. This can lead to results in very fast increases of temperature at the spot of impact, causing the melting or even evaporation of any material, depending on working conditions.