Parse this person name:

Heinz Oestrovsky, Milka Siegward S. Freya Bernward, 1856-1903
user
first_name: Milka
last_name: Heinz Oestrovsky
middle_names:
- Siegward
- S.
- Freya
- Bernward
temporal:
- start: 1856
  end: 1903
  type: life_span
titles: []
extra_info: []
assistant