Complex sentence: Opiates decrease spine density, dendrite complexity, and cell body size in the nucleus accumbens (NAc), medial prefrontal cortex (mPFC), hippocampus, and ventral tegmental area (VTA).
Split into simpler sentences: Opiates decrease spine density and dendrite complexity in the nucleus accumbens (NAc), medial prefrontal cortex (mPFC), and the hippocampus. Cell body size in the ventral tegmental area (VTA).