Complex sentence: Subsequent to her experience, she spoke of it very little and suffered a long-term depression, which she attributed to the anticlimactic nature of returning to corporeality after experiencing the heaven of afterlife.
Split into simpler sentences: Subsequent to her experience, she spoke of it very little and suffered a long-term depression. This, she attributed to the anticlimactic nature of returning to corporeality after experiencing the heaven of afterlife.