Complex sentence: Specifically, age is a major risk factor for most common neurodegenerative diseases, including Mild cognitive impairment, Alzheimer's disease, cerebrovascular disease, Parkinson's disease and Lou Gehrig's disease.
Split into simpler sentences: Specifically, age is a major risk factor for most common neurodegenerative diseases. The spectrum includes Mild cognitive impairment, Alzheimer's disease, cerebrovascular disease, Parkinson's disease and Lou Gehrig's disease.