Parse this person name:

Ansaldo Gradenigo (1915-1957, flourished 1944-1952)
user
first_name: Ansaldo
last_name: Gradenigo
middle_names: []
temporal:
- start: 1915
  end: 1957
  type: life_span
- start: 1944
  end: 1952
  type: flourished
titles: []
extra_info: []
assistant