Parse this person name:

Grein Groth, Willibert H. (Willibert Henning), 1320-1391
user
first_name: Willibert
last_name: Grein Groth
middle_names:
- Henning
temporal:
- start: 1320
  end: 1391
  type: life_span
titles: []
extra_info: []
assistant