It's ugly and unrecommended, but you can do it with eval. For instance...the following code prints out the first argument of the $string array, evaluated at run-time:

print eval('@'.$string.'[0]');

In your case, I think what you're looking for is something like:

foreach $entry ( @combined ) {
my $array = eval('\@'.$entry);
}
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You can do similar incredibly ugly and horribly unrecommended things with eval, but if it gets the job done, it does ;)

I think you can use map to do something similar (see Perl Best Practices pg. 161 "Avoid string eval") which states this kind of behavior is best avoided.