Apart from the chomp thing, there are a few things that can be done more efficiently. If you are new on perl, try reading up on online docs, perldoc, and get accostumed to search.cpan.org (CPAN is your friend).

Try to use join, it is more convenient than a loop:

my $string = join '', @temparray; # or even <FILE>
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Why not use Parse:RecDescent for the parsing?

Otherwise, you can trim some delimiters down, as you do not really need the closing brackets.

use SuperSplit;

$string =~ tr/}//d;
$nested_list = supersplit( ';','{',' ','\n','\n\n', $string );
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Does a decent try at breaking it down, although the code above is a bit rough. RecDescent would be better. Take a look at perlref, perldsc, perllol and perlreftut, you can find a link of the latter in my homenode.

This post would be longer, but I have to celebrate now...

Jeroen
"We are not alone"(FZ)

Update: forgot to add the whiteline