Parse this person name:

Anna van der Steen, 1497-1550, flourished 1520-1541
user
first_name: Anna
last_name: van der Steen
middle_names: []
temporal:
- start: 1497
  end: 1550
  type: life_span
- start: 1520
  end: 1541
  type: flourished
titles: []
extra_info: []
assistant