Parse this person name:

Collin van Leuven (1250-1327, flourished 1277-1303)
user
first_name: Collin
last_name: van Leuven
middle_names: []
temporal:
- start: 1250
  end: 1327
  type: life_span
- start: 1277
  end: 1303
  type: flourished
titles: []
extra_info: []
assistant