Complex sentence: Oxytocin (Oxt,) is a mammalian neurohypophysial hormone (produced by the hypothalamus. Stored and secreted by the posterior pituitary gland) that acts primarily as a neuromodulator in the brain.
Split into simpler sentences: Oxytocin (Oxt,) is a mammalian neurohypophysial hormone. Produced by the hypothalamus and stored and secreted by the posterior pituitary gland, oxytocin that acts primarily as a neuromodulator in the brain.