Parse this person name:

Steven Williams, 1812-1877, flourished 1840-1865
user
first_name: Steven
last_name: Williams
middle_names: []
temporal:
- start: 1812
  end: 1877
  type: life_span
- start: 1840
  end: 1865
  type: flourished
titles: []
extra_info: []
assistant