Complex sentence: Rey gives her the task of destroying the Requiem's main control system Shinn is concerned for her safety but she convinces him to believe in him, with Shinn protecting her with the Destiny she enters Requiem's control base and destroys it.
Split into simpler sentences: Rey gives her the task of destroying the Requiem's main control system. With Shinn protecting her with the Destiny, she enters Requiem's control base and destroys it.