To create a hash of hashes for that line, you can do this:

my %hash_of_hashes= ( one => { two => 'three four five' } );
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A hash of hashes is a simple hash, where each value is a pointer to another hash.
To see how this looks like try this:

use strict;
use warnings;
use Data::Dumper;

my %hash_of_hashes= ( one => { two => 'three four five' } );

print Dumper \%hash_of_hashes;
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