Parse this person name:

Siegbert Stey, 1902-1974, flourished 1921-1936
user
first_name: Siegbert
last_name: Stey
middle_names: []
temporal:
- start: 1902
  end: 1974
  type: life_span
- start: 1921
  end: 1936
  type: flourished
titles: []
extra_info: []
assistant