#!/usr/bin/perl

use strict;
use warnings;

{
    my @names =
      ( [ 'John Doe Joe', 1 ], [ 'John D', 1 ], [ 'John ', 0 ],
        [ 'John', 0 ], );

    foreach my $lr (@names) {
        my ( $name, $success ) = @{$lr};
        my @result = split( /\s/, $name );

        if ( ( @result  > 1 &&  $success ) ||
             ( @result == 1 && !$success ) ) {

            print "$name split correctly, list has "
              . ( scalar @result )
              . " elements. - ";
        }
        else {

            print "$name split incorrectly, list has "
              . ( scalar @result )
              . " elements. - ";
        }
		print join('|',@result) . "\n";
    }
}

##</code><code>##

$ perl -w 1130518.pl 
John Doe Joe split correctly, list has 3 elements. - John|Doe|Joe
John D split correctly, list has 2 elements. - John|D
John  split correctly, list has 1 elements. - John
John split correctly, list has 1 elements. - John
$