Parse this person name:

Ansgar van der Dussen (1209-1270, flourished 1227-1238)
user
first_name: Ansgar
last_name: van der Dussen
middle_names: []
temporal:
- start: 1209
  end: 1270
  type: life_span
- start: 1227
  end: 1238
  type: flourished
titles: []
extra_info: []
assistant