Parse this person name:

Sienna van Saksen'de Pauw (1777-1826, flourished 1800-1821)
user
first_name: Sienna
last_name: van Saksen'de Pauw
middle_names: []
temporal:
- start: 1777
  end: 1826
  type: life_span
- start: 1800
  end: 1821
  type: flourished
titles: []
extra_info: []
assistant