Parse this person name:

Sigurd Kobelt (1521-1583, flourished 1550-1572)
user
first_name: Sigurd
last_name: Kobelt
middle_names: []
temporal:
- start: 1521
  end: 1583
  type: life_span
- start: 1550
  end: 1572
  type: flourished
titles: []
extra_info: []
assistant