Parse this person name:

Gerrit Jansdr, 1761-1831, flourished 1789-1814
user
first_name: Gerrit
last_name: Jansdr
middle_names: []
temporal:
- start: 1761
  end: 1831
  type: life_span
- start: 1789
  end: 1814
  type: flourished
titles: []
extra_info: []
assistant