Parse this person name:

Sander van Kempen, 1411-1481, flourished 1440-1462
user
first_name: Sander
last_name: van Kempen
middle_names: []
temporal:
- start: 1411
  end: 1481
  type: life_span
- start: 1440
  end: 1462
  type: flourished
titles: []
extra_info: []
assistant