Parse this person name:

Steven Clements, 1243-1283, flourished 1268-1278
user
first_name: Steven
last_name: Clements
middle_names: []
temporal:
- start: 1243
  end: 1283
  type: life_span
- start: 1268
  end: 1278
  type: flourished
titles: []
extra_info: []
assistant