Parse this person name:

Stephen Jefferson, 1363-1419, flourished 1391-1403
user
first_name: Stephen
last_name: Jefferson
middle_names: []
temporal:
- start: 1363
  end: 1419
  type: life_span
- start: 1391
  end: 1403
  type: flourished
titles: []
extra_info: []
assistant