Parse this person name:

Senn Geldens (1819-1883, flourished 1838-1855)
user
first_name: Senn
last_name: Geldens
middle_names: []
temporal:
- start: 1819
  end: 1883
  type: life_span
- start: 1838
  end: 1855
  type: flourished
titles: []
extra_info: []
assistant