Parse this person name:

Joseph Schaaf (1754-1831, flourished 1784-1805)
user
first_name: Joseph
last_name: Schaaf
middle_names: []
temporal:
- start: 1754
  end: 1831
  type: life_span
- start: 1784
  end: 1805
  type: flourished
titles: []
extra_info: []
assistant