Complex sentence: She manages to undo Knives' tampering, allowing a number of the ships to land safely, but perishes as her ship explodes in the atmosphere; her last words to Vash told him to "take care of Knives".
Split into simpler sentences: She manages to undo Knives' tampering, allowing a number of the ships to land safely, although the ship she is on is not one of them. Her last words to Vash told him to "take care of Knives".