Parse this person name:

Steven Shepard (1308-1348, flourished 1323-1343)
user
first_name: Steven
last_name: Shepard
middle_names: []
temporal:
- start: 1308
  end: 1348
  type: life_span
- start: 1323
  end: 1343
  type: flourished
titles: []
extra_info: []
assistant