Parse this person name:

Merijn Pieters van der Maes (1250-1327, flourished 1276-1291)
user
first_name: Merijn
last_name: Pieters van der Maes
middle_names: []
temporal:
- start: 1250
  end: 1327
  type: life_span
- start: 1276
  end: 1291
  type: flourished
titles: []
extra_info: []
assistant