Parse this person name:

Ben Demmendaal (1411-1451, flourished 1435-1446)
user
first_name: Ben
last_name: Demmendaal
middle_names: []
temporal:
- start: 1411
  end: 1451
  type: life_span
- start: 1435
  end: 1446
  type: flourished
titles: []
extra_info: []
assistant