Parse this person name:

Gunnar Zorbach (1728-1778, flourished 1748-1773)
user
first_name: Gunnar
last_name: Zorbach
middle_names: []
temporal:
- start: 1728
  end: 1778
  type: life_span
- start: 1748
  end: 1773
  type: flourished
titles: []
extra_info: []
assistant