Parse this person name:

Stephen Barnes (1919-1982, flourished 1942-1957)
user
first_name: Stephen
last_name: Barnes
middle_names: []
temporal:
- start: 1919
  end: 1982
  type: life_span
- start: 1942
  end: 1957
  type: flourished
titles: []
extra_info: []
assistant