Parse this person name:

Femke van den Berg (1204-1255, flourished 1234-1250)
user
first_name: Femke
last_name: van den Berg
middle_names: []
temporal:
- start: 1204
  end: 1255
  type: life_span
- start: 1234
  end: 1250
  type: flourished
titles: []
extra_info: []
assistant