Complex sentence: The effects are not limited to the nose and these medicines may cause hypertension (high blood pressure) through vasoconstriction, but most decongestants are not pronounced stimulants due to lack of response from the other adrenoreceptors.
Split into simpler sentences: The effects are not limited to the nose, and these medicines may cause hypertension (high blood pressure) through vasoconstriction. But most decongestants are not pronounced stimulants due to lack of response from the other adrenoreceptors.