[Python] python regex: match the dot only, not the letter before it

I have a regex pattern as follows:

r'(??<!\.|\s)[a-z]\.|(?<!\.|\s)[A-Z]\.)+'


and I am trying to modify that so it only matches the dot at the end of the sentences and not the letter before them. here is my string:

sent = 'This is the U.A. we have r.a.d. golden 13.56 date. a better date 34. was there.'


and here is what i have done:

import re
re.split(r'(??<!\.|\s)[a-z]\.|(?<!\.|\s)[A-Z]\.)+', sent)


however what happens is that it removes the last letter of the words:

current output:
['This is the U.A. we have r.a.d. golden 13.56 dat',' a better date 34. was ther',
'']


my desired output is:

['This is the U.A. we have r.a.d. golden 13.56 date',' a better date 34. was there',
'']


i do not know how I can modify the pattern to keep the last letter of the words 'date', and 'there'

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