Parse this person name:

Ben van den Berg, 1208-1256, flourished 1235-1251
user
first_name: Ben
last_name: van den Berg
middle_names: []
temporal:
- start: 1208
  end: 1256
  type: life_span
- start: 1235
  end: 1251
  type: flourished
titles: []
extra_info: []
assistant