Parse this person name:

Sigfried Hethur (1316-1383, flourished 1342-1369)
user
first_name: Sigfried
last_name: Hethur
middle_names: []
temporal:
- start: 1316
  end: 1383
  type: life_span
- start: 1342
  end: 1369
  type: flourished
titles: []
extra_info: []
assistant