Parse this person name:

Gundolf Krein (1351-1427, flourished 1380-1390)
user
first_name: Gundolf
last_name: Krein
middle_names: []
temporal:
- start: 1351
  end: 1427
  type: life_span
- start: 1380
  end: 1390
  type: flourished
titles: []
extra_info: []
assistant