Complex sentence: The nucleus accumbens (NAcc) is a unique component of the brain, since it cannot elicit reward and learning responses without letting the brain inject dopamine into it or without letting the brain process the stimuli received.
Split into simpler sentences: The nucleus accumbens (NAcc) is a unique component of the brain. The NAcc cannot elicit reward and learning responses without letting the brain inject dopamine into it or without letting the brain process the stimuli received.