Complex sentence: In contrast, the early socialization that is a must for puppies is limited in a prison: all men, or all women, all dressed the same, few if any children, and a lack of new and various scents.
Split into simpler sentences: In contrast, the early socialization that is a must for puppies is limited at best. All men, or women, all dressed the same, few if any children, and a lack of new and various scents.