Parse this person name:

Alex Janssen, 1273-1313, flourished 1296-1308
user
first_name: Alex
last_name: Janssen
middle_names: []
temporal:
- start: 1273
  end: 1313
  type: life_span
- start: 1296
  end: 1308
  type: flourished
titles: []
extra_info: []
assistant