The following could get you started. Cheers. 
use warnings;
use strict;

my $SPACER = "\n\n";

while (my $line = <DATA>) {
    $line =~ s|^\s+||;  ## trim leading whitespace
    $line =~ s|\s+$||;  ## trim trailing whitespace
    $line =~ s|([.?!]+)\s*|$1$SPACER|g;       ## break at [.?!]
    $line =~ s|([a-z])([A-Z])|$1$SPACER$2|g;  ## break at camelCase
    print $line . $SPACER;
}

[download]
__DATA__
The Tell-Tale LiverEdgar Allen MyselfFALSE! nervous I had been and am;
+ but am I mad?   The disease had sharpened, not destroyed my senses..
+.   Above all was the sense of hearing acute.How then am I mad?!     
+    Hearken! and observe how calmly, I can tell you the story.

[download]
prints: 
The Tell-Tale Liver

Edgar Allen Myself

FALSE!

nervous I had been and am; but am I mad?

The disease had sharpened, not destroyed my senses...

Above all was the sense of hearing acute.

How then am I mad?!

Hearken!

and observe how calmly, I can tell you the story.

[download]

In reply to Re: Using punctuation to split a text by fenLisesi
in thread Using punctuation to split a text by UrbanHick

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.