splitting the scalar variables in an array

[sunil9009]

I have a list of hostclasses each having a list of host, I want to combine all the hosts in the hostclasses to give me an array of hosts. Command "expand-hostclass" gives me a list of hosts with each host as a newline. My problem is that the array considers hosts in each hostclass as a scalar ($hosts_per_hostclass).I want to flatten the scalar ($hosts_per_hostclass) to an array, so that each element in the array is a hostname. Hope I am not confusing too much Please help. I tried the following code

#!/usr/bin/perl
my @hostclass = ('Hostclass-A','Hostclass-B','Hostclass-C');
my @hosts;
my @TotalHosts;
my $class;
my $hosts_per_hostclass;

gethosts();

sub gethosts {
foreach $class(@hostclass) {
$hosts_per_hostclass = `expand-hostclass` ;
push (@TotalHosts,$hosts_per_hostclass);
my @dd = split "\n", @TotalHosts;
print "@dd \n";
}
}