Complex sentence: Esketamine or ("S")-ketamine (brand: Ketanest S) is a general anaesthetic of the dissociative class by way of the central nervous system and has its mode of action as an NMDA receptor antagonist.
Split into simpler sentences: Esketamine or ("S")-ketamine (brand: Ketanest S) is a general anaesthetic of the dissociative class. It acts by way of the central nervous system and has its mode of action as an NMDA receptor antagonist.