Parse this person name:

Siem Geerling, 1401-1453, flourished 1423-1443
user
first_name: Siem
last_name: Geerling
middle_names: []
temporal:
- start: 1401
  end: 1453
  type: life_span
- start: 1423
  end: 1443
  type: flourished
titles: []
extra_info: []
assistant