Parse this person name:

Sigmund Krein, 1508-1575, flourished 1534-1561
user
first_name: Sigmund
last_name: Krein
middle_names: []
temporal:
- start: 1508
  end: 1575
  type: life_span
- start: 1534
  end: 1561
  type: flourished
titles: []
extra_info: []
assistant