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($sub1, $sub2, $sub3) = split (/\_/, @array,3);

while my $elem (@array)
{
  ($sub1,$sub2,$sub3) = split(/_/, $elem, 3);
  # do something here...
}

$sub3 = sort { $b <=> $a } $sub3;

my @a2;
while my $elem (@array)
...
  push @a2, \@fields;
}
my @a3 = sort { $b->[2] <=> $a->[2]} @a2;