Parse this person name:

Mick van den Berg (1221-1281, flourished 1236-1251)
user
first_name: Mick
last_name: van den Berg
middle_names: []
temporal:
- start: 1221
  end: 1281
  type: life_span
- start: 1236
  end: 1251
  type: flourished
titles: []
extra_info: []
assistant