This text looks like JSON (http://json.org). JSON can be easily processed by JSON or JSON::XS modules.

use strict;
use warnings;

use Data::Dumper;
use JSON;

my $json_text = q{
{
    "InstanceStatuses": [
    {
        "InstanceId": "i-308c0b3c",
            "InstanceState": {
                "Code": 16,
                "Name": "running"
            },
            "AvailabilityZone": "us-west-2b",
            "SystemStatus": {
                "Status": "ok",
                "Details": [
                {
                    "Status": "passed",
                    "Name": "reachability"
                }
                ]
            },
            "InstanceStatus": {
                "Status": "ok",
                "Details": [
                {
                    "Status": "passed",
                    "Name": "reachability"
                }
                ]
            }
    }
    ]
}
};

# decode JSON text
my $hashref  = decode_json $json_text;

# dump the hashref
print Dumper( $hashref ) . "\n";

# access Name
print "Name: '$hashref->{InstanceStatuses}->[0]->{InstanceState}->{Nam
+e}'\n";
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