Parse this person name:

Stefan Veenstra, 1346-1404, flourished 1368-1390
user
first_name: Stefan
last_name: Veenstra
middle_names: []
temporal:
- start: 1346
  end: 1404
  type: life_span
- start: 1368
  end: 1390
  type: flourished
titles: []
extra_info: []
assistant