Parse this person name:

Svetlana Gnatz (1234-1276, flourished 1257-1271)
user
first_name: Svetlana
last_name: Gnatz
middle_names: []
temporal:
- start: 1234
  end: 1276
  type: life_span
- start: 1257
  end: 1271
  type: flourished
titles: []
extra_info: []
assistant