Complex sentence: Some neurons in the OVLT are sensitive to the osmotic pressure of the blood, and these neurons project to the supraoptic nucleus and paraventricular nucleus to regulate the activity of vasopressin-secreting neurons.
Split into simpler sentences: Some neurons in the OVLT are osmoreceptors, being sensitive to the osmotic pressure of the blood. These neurons project to the supraoptic nucleus and paraventricular nucleus to regulate the activity of vasopressin-secreting neurons.