Complex sentence: The end-user or consumer may differ from the customer, who might buy the product, but doesn't necessarily use it; for example, a zookeeper, the customer, might purchase elephant food for an end-user: the elephant.
Split into simpler sentences: The end-user or consumer may differ from the person who purchases the product. For instance, a zookeeper, the customer, might purchase elephant food for an end-user: the elephant.