Parse this person name:

Siem Dekker (1406-1483, flourished 1432-1459)
user
first_name: Siem
last_name: Dekker
middle_names: []
temporal:
- start: 1406
  end: 1483
  type: life_span
- start: 1432
  end: 1459
  type: flourished
titles: []
extra_info: []
assistant