Complex sentence: She wants to get back the sky above her village, which was sealed off by humans building cities above her village, was recently sent by the Elder to retrieve the bounty on Ragna's head, becoming a vigilante in the process.
Split into simpler sentences: She wants to get back the sky above her village, which was sealed off by humans building cities above her village. She recently was sent by the Elder to retrieve the bounty on Ragna's head, becoming a vigilante in the process.