Parse this person name:

Leonid Kühnert, 1655-1731, flourished 1675-1703
user
first_name: Leonid
last_name: Kühnert
middle_names: []
temporal:
- start: 1655
  end: 1731
  type: life_span
- start: 1675
  end: 1703
  type: flourished
titles: []
extra_info: []
assistant