Parse this person name:

Alexander Schakelaar (1389-1446, flourished 1416-1441)
user
first_name: Alexander
last_name: Schakelaar
middle_names: []
temporal:
- start: 1389
  end: 1446
  type: life_span
- start: 1416
  end: 1441
  type: flourished
titles: []
extra_info: []
assistant