Parse this person name:

Martinez Maynard, Kelsey Cynthia Lisa Heather X. Bradley, 1262-1319
user
first_name: Kelsey
last_name: Martinez Maynard
middle_names:
- Cynthia
- Lisa
- Heather
- X.
- Bradley
temporal:
- start: 1262
  end: 1319
  type: life_span
titles: []
extra_info: []
assistant