Parse this person name:

Alejo Bertrán (1309-1358, flourished 1328-1351)
user
first_name: Alejo
last_name: Bertrán
middle_names: []
temporal:
- start: 1309
  end: 1358
  type: life_span
- start: 1328
  end: 1351
  type: flourished
titles: []
extra_info: []
assistant