Complex sentence: As with all neuroleptic drugs, olanzapine can cause the (sometimes) irreversible movement disorder tardive dyskinesia, and the rare, but life-threatening, neuroleptic malignant syndrome.
Split into simpler sentences: As with all neuroleptic drugs, olanzapine can cause the (sometimes) irreversible movement disorder tardive dyskinesia. Another concern is the rare, but life-threatening, neuroleptic malignant syndrome.