#Python 2, 62

Not going to improve for the bonus, as it's probably not worth the byte cost.

import re
print' '.join(re.split('(?<=[?!.]).',input())[::-1])

Python 2, 62

Not going to improve for the bonus, as it's probably not worth the byte cost.

import re
print' '.join(re.split('(?<=[?!.]).',input())[::-1])

#Python 2, 62

I may improve this to allow quotes or parentheses later.

import re
print' '.join(re.split('(?<=[?!.])',input())[::-1])

#Python 2, 62

Not going to improve for the bonus, as it's probably not worth the byte cost.

import re
print' '.join(re.split('(?<=[?!.]).',input())[::-1])

#Python 2, 62 66 - 5 = 61

Improved for bonus using raw_input.

import re
print' '.join(re.split('(?<=[?!.]).',raw_input())[::-1])

EDIT: Found that I pasted a wrong version of the code so my very first post didn't work. The regex was missing a .. The byte count was still 62.

#Python 3, 64 - 5 = 59

Shorter since I can use input().

import re
print(' '.join(re.split('(?<=[?!.]).',input())[::-1]))

#Python 2, 62

I may improve this to allow quotes or parentheses later.

import re
print' '.join(re.split('(?<=[?!.])',input())[::-1])