Parse this person name:

Primitivo B. Santos Valerio Sebastian Gregorio Grau hijo, alrededor 1380-1454
user
first_name: Primitivo
last_name: Grau
middle_names:
- B.
- Santos
- Valerio
- Sebastian
- Gregorio
temporal:
- start: 1380
  end: 1454
  type: life_span
titles: []
extra_info: []
assistant