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Given that the input is one single line of text, try
awk '
{N = split ($0, T, ".")
CNT = 1
while (CNT <= N) {RND = int(5*(1+rand()))
...

I'm not aware of a random function in sed; which version do you use?

And, while your code sample (ignoring the RANDOM stuff) will add a <NL> char to some EOL (end of line), in post#1 you specify...