Parse this person name:

Alexander de Kale-Aelftrud van Wessex (1402-1470, flourished 1431-1444)
user
first_name: Alexander
last_name: de Kale-Aelftrud van Wessex
middle_names: []
temporal:
- start: 1402
  end: 1470
  type: life_span
- start: 1431
  end: 1444
  type: flourished
titles: []
extra_info: []
assistant