while (<DATA>)
{
        my ($onetwo,$three) = $_=~/(.*)\|(.*)/;
        push @{$hash{$onetwo}},$three;
}
for (sort keys %hash)
{
        print $_."|",join ",",@{$hash{$_}};
        print "\n";
}


__DATA__
aaa|bbb|ccc
ddd|eee|fff
ddd|eee|xxxxx
hhh|iiii|jjjjjj