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With awk
awk '{gsub(/\. /,".\n");print}' infile

That will convert every period and space to a newline, not append a newline after the period.




If that doesn't work for the OP, it's probably because \n in the replacement text is a GNU...

This regex seems to also return the required output:

grep -o "([^)]\+ [0-9]\{4\})" file

But it will fail on the citations spread on multiple lines as in:


Suggestion, first get rid of all...

Yes, instead of the -A5 option you used before try -B5. AND, read the man page.
BTW, this would not yield the sentence but the last 5 lines before. If you go for the sentence, this will become...

This would yield all lines from your sample above but suppress many other text lines. If it's too open, try narrowing it down by becoming more specific, e.g. on the year numbers:$ grep -E...