Parse this person name:

Siem van den Henst, 1664-1706, flourished 1690-1701
user
first_name: Siem
last_name: van den Henst
middle_names: []
temporal:
- start: 1664
  end: 1706
  type: life_span
- start: 1690
  end: 1701
  type: flourished
titles: []
extra_info: []
assistant