Parse this person name:

William Young (1936-2007, flourished 1955-1968)
user
first_name: William
last_name: Young
middle_names: []
temporal:
- start: 1936
  end: 2007
  type: life_span
- start: 1955
  end: 1968
  type: flourished
titles: []
extra_info: []
assistant