Parse this person name:

Sigismund Seifert, 1945-2003, flourished 1973-1983
user
first_name: Sigismund
last_name: Seifert
middle_names: []
temporal:
- start: 1945
  end: 2003
  type: life_span
- start: 1973
  end: 1983
  type: flourished
titles: []
extra_info: []
assistant