Complex sentence: Reduced affect refers to reduced emotional reactivity (affect display) in an individual that manifests as a failure to express feelings either verbally or non-verbally, especially when talking about issues that would normally be expected to engage the emotions.
Split into simpler sentences: Reduced affect refers to reduced emotional reactivity (affect display) in an individual. It manifests as a failure to express feelings either verbally or non-verbally, especially when talking about issues that would normally be expected to engage the emotions.