Complex sentence: Speculative suggestions have been made that an increase of N-Dimethyltryptamine levels in the pineal gland, or stimulation of the temporal lobe by psychoactive ingredients of Magic Mushrooms mimics religious experiences.
Split into simpler sentences: Speculative suggestions have been made that an increase of N-Dimethyltryptamine levels in the pineal gland contribute to spiritual experiences. It has also been suggested that stimulation of the temporal lobe by psychoactive ingredients of Magic Mushrooms mimics religious experiences.