Parse this person name:

Pierre Grenier, 1731-1809, flourished 1756-1783
user
first_name: Pierre
last_name: Grenier
middle_names: []
temporal:
- start: 1731
  end: 1809
  type: life_span
- start: 1756
  end: 1783
  type: flourished
titles: []
extra_info: []
assistant