Parse this person name:

Demi van Velthoven-Ellis (1847-1903, flourished 1874-1894)
user
first_name: Demi
last_name: van Velthoven-Ellis
middle_names: []
temporal:
- start: 1847
  end: 1903
  type: life_span
- start: 1874
  end: 1894
  type: flourished
titles: []
extra_info: []
assistant