Complex sentence: In addition, the sensation of "liking" can occur which provides a stimulation of pleasure when activation of opioid in the nucleus accumbens evaluates the unfamiliar situation or environment and attaches a value to the novel object.
Split into simpler sentences: In addition, the sensation pleasure or of "liking" can occur when opioids are released by nucleus accumbens. This helps someone evaluate the unfamiliar situation or environment and attach value to the novel object.