Parse this person name:

Kenneth Brown (1216-1270, flourished 1238-1259)
user
first_name: Kenneth
last_name: Brown
middle_names: []
temporal:
- start: 1216
  end: 1270
  type: life_span
- start: 1238
  end: 1259
  type: flourished
titles: []
extra_info: []
assistant