Parse this person name:

Alexander van der Laan, 1210-1251, flourished 1238-1246
user
first_name: Alexander
last_name: van der Laan
middle_names: []
temporal:
- start: 1210
  end: 1251
  type: life_span
- start: 1238
  end: 1246
  type: flourished
titles: []
extra_info: []
assistant