Complex sentence: Indeed, the concept of full-scale war is unknown to Gethenian societies, but it seems possible that Gethen is now drifting towards a war between Karhide and Orgoreyn.
Split into simpler sentences: Indeed, the concept of full-scale war is unknown to Gethenian societies. But it seems possible that Gethen is now drifting towards a war between Karhide and Orgoreyn.