Parse this person name:

Brian Valenzuela, 1420-1464, flourished 1446-1459
user
first_name: Brian
last_name: Valenzuela
middle_names: []
temporal:
- start: 1420
  end: 1464
  type: life_span
- start: 1446
  end: 1459
  type: flourished
titles: []
extra_info: []
assistant