split takes a pattern as first argument, so your code doesn't do what you think. See
split for details.
What you probably want is
my @Parts = split ' ', $Phrase;
.
Update: Also, note the subtle difference between split / / and split ' '. The latter is "magical" in that it drops leading whitespace, splits on runs of spaces instead of a single space. The following may demonstrate:
my $s = ' a b c ';
my @p = split ' ', $s;
print map { ">$_< " } @p;
my @q = split " ", $s;
print map { ">$_< " } @q;
my @r = split / /, $s;
print map { ">$_< " } @r;
my @s = split /\s+/, $s;
print map { ">$_< " } @s;
__END__
>a< >b< >c<
>a< >b< >c<
>< >< >< >a< >< >< >< >< >b< >< >< >c<
>< >a< >b< >c<
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