Parse this person name:

Gunar Jäntsch, 1340-1413, flourished 1360-1381
user
first_name: Gunar
last_name: Jäntsch
middle_names: []
temporal:
- start: 1340
  end: 1413
  type: life_span
- start: 1360
  end: 1381
  type: flourished
titles: []
extra_info: []
assistant