Parse this person name:

William Blanc (1919-1978, flourished 1939-1959)
user
first_name: William
last_name: Blanc
middle_names: []
temporal:
- start: 1919
  end: 1978
  type: life_span
- start: 1939
  end: 1959
  type: flourished
titles: []
extra_info: []
assistant