Complex sentence: Tsez is an ergative--absolutive language, which means that it makes no distinction between the subject of an intransitive sentence and the object of a transitive one--both are in the unmarked absolutive case; the subject of the transitive sentence is in the ergative case.
Split into simpler sentences: Tsez is an ergative--absolutive language, which means that it makes no distinction between the subject of an intransitive sentence and the object of a transitive one. Both are in the unmarked absolutive case; the subject of the transitive sentence is in the ergative case.