Parse this person name:

Nathan van Heusden, 1214-1267, flourished 1229-1246
user
first_name: Nathan
last_name: van Heusden
middle_names: []
temporal:
- start: 1214
  end: 1267
  type: life_span
- start: 1229
  end: 1246
  type: flourished
titles: []
extra_info: []
assistant