Connecting lists for tree view

[minasal]

Hello,
I have a list of datetime objects that will look like below

('John', datetime.datetime(1984, 8, 26), datetime.datetime(2021, 8, 26))
('Peter', datetime.datetime(2021, 8, 26), datetime.datetime(2028, 8, 26))
('Madame', datetime.datetime(2028, 8, 26), datetime.datetime(2038, 8, 26))
('Taouse', datetime.datetime(2038, 8, 26), datetime.datetime(2044, 8, 26))
('Paul', datetime.datetime(2044, 8, 26), datetime.datetime(2054, 8, 26))

Basically a name, from date, to date. For each name interval, i divide them with a certain value and will get another list like below,

('JohnPart1', datetime.datetime(1984, 8, 26), datetime.datetime(1997, 1, 22))
('JohnPart2', datetime.datetime(1997, 1, 22), datetime.datetime(2008, 1, 19))
('JohnPart3', datetime.datetime(2008, 1, 19), datetime.datetime(2020, 11, 19))
('JohnPart4', datetime.datetime(2020, 11, 19), datetime.datetime(2021, 9, 26))

i.e John has a interval from 1984 to 2021 and i have divided that into sub periods, like this i have done for other names as well and for each name there will be 4 parts, so my sub period list will have 20 values in them, i want to display them in a tree view , i would like to know how can i connect the main list with corresponding sub period list, any help will be appreciated