Complex sentence: This additional term describes the collisions of charged particles with neutral particles in the plasma by frequency of collisions, by denoting\\ nu--as the frequency of collisions between electrons and neutrals, and\\ nu--as the frequency of collisions between ions and neutrals.
Split into simpler sentences: This additional term describes the collisions of charged particles with neutral particles in the plasma by frequency of collisions. We denote\\ nu--as the frequency of collisions between electrons and neutrals, and\\ nu--as the frequency of collisions between ions and neutrals.