Parse this person name:

Pleun Arens (1804-1878, flourished 1834-1861)
user
first_name: Pleun
last_name: Arens
middle_names: []
temporal:
- start: 1804
  end: 1878
  type: life_span
- start: 1834
  end: 1861
  type: flourished
titles: []
extra_info: []
assistant