Final answer:
Complicated grief is the disorder described by Holly Prigerson and her colleagues that involves enduring unresolved despair over an extended period of time.
Step-by-step explanation:
The grief disorder described by Holly Prigerson and her colleagues that involves enduring unresolved despair over an extended period of time is called Complicated grief. Complicated grief refers to a persistent and intense form of grief that may have difficulty diminishing over time. Unlike normal grief reactions, it can interfere with daily functioning and quality of life.