Parse this person name:

Alex Sitters, 1857-1915, flourished 1878-1904
user
first_name: Alex
last_name: Sitters
middle_names: []
temporal:
- start: 1857
  end: 1915
  type: life_span
- start: 1878
  end: 1904
  type: flourished
titles: []
extra_info: []
assistant