Parse this person name:

Mart Sitters, 1404-1461, flourished 1430-1450
user
first_name: Mart
last_name: Sitters
middle_names: []
temporal:
- start: 1404
  end: 1461
  type: life_span
- start: 1430
  end: 1450
  type: flourished
titles: []
extra_info: []
assistant