Complex sentence: Using the beta test game-based Gashat allows Kuroto to become, a dark version of Ex-Aid who is stronger than him due to using a prototype Gashat which has unlimited powers, but can harm the user's body from prolonged use.
Split into simpler sentences: Using the beta test game-based Gashat allows Kuroto to become. Genm is stronger than Ex-Aid due to using a prototype Gashat, which has unlimited powers but can harm the user's body from prolonged use.