Parse this person name:

Rivière Étienne, Alphonse V. U. Marthe, 1950-1995
user
first_name: Alphonse
last_name: Rivière Étienne
middle_names:
- V.
- U.
- Marthe
temporal:
- start: 1950
  end: 1995
  type: life_span
titles: []
extra_info: []
assistant