Complex sentence: It is this intensity, and the remoteness of the outpost, which engenders jealousy, obsession, and the almost inevitable violent outcome when a centurion develops a relentless desire for Sebastian, who rejects his advances.
Split into simpler sentences: It is this intensity, and the remoteness of the outpost, which engenders jealousy, obessession, and the almost inevitable violent outcome. A centurion has an obsessive desire for Sebastian, who rejects his advances.