No. You can do that, but it will effect the printed output. And you are asking if you can do it without changing the output.

But ++ for the motivation to format your code for readability.

There are many, many situations where you can break a line of code in the middle without hurting things. I would go so far as to say you can do it in most cases. (White space is white space: \n is as good as \s or \t.) And inserting a newline here will not break the code, but it does change the output. So...

print "Here's a long line blah blah "
    . "blah that I would like broken up\n";
#or
print "Here's a long line blah blah ",
      "blah that I would like broken up\n";
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Note here that the comma works specifically because of "print"s ability to handle a series of values. But comma will not work for $somevar = "...". For that, the dot concatenation approach does the job.