Why not just join?

for (sort keys %h2) {
    print join " ", $_, values %{$h2{$_}};
}
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If you provide a (<code> tag delimited) copy of exactly what you'd like, we might be able to come up with a better answer.

Also, if you are relying on a special variable to format properly, you should get in the habit of explicitly localizing and initializing it to the value you want. Otherwise, spooky action at a distance may come to visit.