Parse this person name:

Sandra Powell (1916-1978, flourished 1934-1963)
user
first_name: Sandra
last_name: Powell
middle_names: []
temporal:
- start: 1916
  end: 1978
  type: life_span
- start: 1934
  end: 1963
  type: flourished
titles: []
extra_info: []
assistant