Parse this person name:

Siem Mahieu (1453-1515, flourished 1469-1485)
user
first_name: Siem
last_name: Mahieu
middle_names: []
temporal:
- start: 1453
  end: 1515
  type: life_span
- start: 1469
  end: 1485
  type: flourished
titles: []
extra_info: []
assistant