Parse this person name:

Alejo Dueñas (1950-2006, flourished 1979-1996)
user
first_name: Alejo
last_name: Dueñas
middle_names: []
temporal:
- start: 1950
  end: 2006
  type: life_span
- start: 1979
  end: 1996
  type: flourished
titles: []
extra_info: []
assistant