Complex sentence: If the language has morphological case, then the arguments of a transitive verb are marked using the agentive case for the subject and the patientive case for the object, while the argument of an intransitive verb may be marked as either.
Split into simpler sentences: If the language has morphological case, the arguments of a transitive verb are marked by using the agentive case for the subject and the patientive case for the object. The argument of an intransitive verb may be marked as either.