Parse this person name:

Mason van Formbach (1217-1290, flourished 1247-1261)
user
first_name: Mason
last_name: van Formbach
middle_names: []
temporal:
- start: 1217
  end: 1290
  type: life_span
- start: 1247
  end: 1261
  type: flourished
titles: []
extra_info: []
assistant