Complex sentence: The release of dopamine in the nucleus accumbens plays a role in the reinforcing qualities of many forms of stimuli, including naturally reinforcing stimuli like palatable food and sex; however, altered dopamine neurotransmission is not a necessary condition for the development of an addictive state.
Split into simpler sentences: The release of dopamine in the nucleus accumbens plays a role in the reinforcing qualities of many forms of stimuli, including naturally reinforcing stimuli like palatable food and sex. Altered dopamine neurotransmission is not a necessary condition for the development of an addictive state.