Parse this person name:

Folker Kroker, 1393-1442, flourished 1422-1437
user
first_name: Folker
last_name: Kroker
middle_names: []
temporal:
- start: 1393
  end: 1442
  type: life_span
- start: 1422
  end: 1437
  type: flourished
titles: []
extra_info: []
assistant