Parse this person name:

William Sanchez, 1403-1448, flourished 1430-1443
user
first_name: William
last_name: Sanchez
middle_names: []
temporal:
- start: 1403
  end: 1448
  type: life_span
- start: 1430
  end: 1443
  type: flourished
titles: []
extra_info: []
assistant