Parse this person name:

Burkhard Krein-Ehlert (1247-1303, flourished 1271-1289)
user
first_name: Burkhard
last_name: Krein-Ehlert
middle_names: []
temporal:
- start: 1247
  end: 1303
  type: life_span
- start: 1271
  end: 1289
  type: flourished
titles: []
extra_info: []
assistant