Parse this person name:

Justin Mens (1812-1865, flourished 1834-1860)
user
first_name: Justin
last_name: Mens
middle_names: []
temporal:
- start: 1812
  end: 1865
  type: life_span
- start: 1834
  end: 1860
  type: flourished
titles: []
extra_info: []
assistant