Parse this person name:

Nicholas Stephens (1406-1465, flourished 1423-1440)
user
first_name: Nicholas
last_name: Stephens
middle_names: []
temporal:
- start: 1406
  end: 1465
  type: life_span
- start: 1423
  end: 1440
  type: flourished
titles: []
extra_info: []
assistant