Parse this person name:

Valeri Kusch, 1858-1928, flourished 1874-1899
user
first_name: Valeri
last_name: Kusch
middle_names: []
temporal:
- start: 1858
  end: 1928
  type: life_span
- start: 1874
  end: 1899
  type: flourished
titles: []
extra_info: []
assistant