Complex sentence: Upon opening the file, his player code is rewritten, and he receives the Twilight Bracelet, which allows him to use Data Drain, the only power capable of defeating the corrupted monsters as well as the Eight Phases of The Cursed Wave.
Split into simpler sentences: Upon opening the file, his player code is rewritten, and he receives the Twilight Bracelet. This allows him to use Data Drain, the only power capable of defeating the corrupted monsters as well as the Eight Phases of The Cursed Wave.