Complex sentence: In Twillight Reki betrays Balmung and is partially responsible for having him fired from his job as a systems administrator, however later Reki supports Balmung in his efforts to stop the twillight incident.
Split into simpler sentences: In Twillight Reki betrays Balmung and is partially responsible for having him fired from his job as a systems administrator. However, Reki later supports Balmung in his efforts to stop the Twillight incident.