Parse this person name:

Valentijn Janssen, 1738-1806, flourished 1757-1779
user
first_name: Valentijn
last_name: Janssen
middle_names: []
temporal:
- start: 1738
  end: 1806
  type: life_span
- start: 1757
  end: 1779
  type: flourished
titles: []
extra_info: []
assistant