Parse this person name:

Demi Grondel (1707-1777, flourished 1731-1755)
user
first_name: Demi
last_name: Grondel
middle_names: []
temporal:
- start: 1707
  end: 1777
  type: life_span
- start: 1731
  end: 1755
  type: flourished
titles: []
extra_info: []
assistant