Parse this person name:

Léon Legrand (1717-1772, flourished 1736-1758)
user
first_name: Léon
last_name: Legrand
middle_names: []
temporal:
- start: 1717
  end: 1772
  type: life_span
- start: 1736
  end: 1758
  type: flourished
titles: []
extra_info: []
assistant