Complex sentence: Kilarul and Tororof head back to Harulu telling her that Karala and her unborn child are whats manifesting the Ide so she decides to both prevent its birth and stop this from happening by killing Karala.
Split into simpler sentences: Kilarul and Tororof head back to Harulu telling her that Karala and her unborn child are what manifests the Ide. Harulu decides to both prevent its birth and stop the Ide's power from invoking by killing Karala.