Parse this person name:

Stephen Alvarado, 1399-1479, flourished 1417-1430
user
first_name: Stephen
last_name: Alvarado
middle_names: []
temporal:
- start: 1399
  end: 1479
  type: life_span
- start: 1417
  end: 1430
  type: flourished
titles: []
extra_info: []
assistant