Parse this person name:

Bjorn Spaan (1928-1994, flourished 1950-1960)
user
first_name: Bjorn
last_name: Spaan
middle_names: []
temporal:
- start: 1928
  end: 1994
  type: life_span
- start: 1950
  end: 1960
  type: flourished
titles: []
extra_info: []
assistant