Parse this person name:

Stephen Rivas, 1884-1964, flourished 1908-1920
user
first_name: Stephen
last_name: Rivas
middle_names: []
temporal:
- start: 1884
  end: 1964
  type: life_span
- start: 1908
  end: 1920
  type: flourished
titles: []
extra_info: []
assistant