Parse this person name:

Sienna Oennen-Bloemendaal, 1916-1971, flourished 1931-1951
user
first_name: Sienna
last_name: Oennen-Bloemendaal
middle_names: []
temporal:
- start: 1916
  end: 1971
  type: life_span
- start: 1931
  end: 1951
  type: flourished
titles: []
extra_info: []
assistant