Complex sentence: She kills their captors and is nearly killed herself, but survives; she permanently loses contact with her spirit guide Louise, who sacrifices her connection to Sylvia in order to save her and Nick, in the process.
Split into simpler sentences: She kills their captors and is nearly killed herself, but survives. However, she permanently loses contact with her spirit guide Louise, who sacrifices her connection to Sylvia in order to save her and Nick, in the process.