The simplest way is to use split.
my @results = split /,/, $branch;
my $desiredAtt = $results;
If you want the returned value to only be the ou value you might look into making it return a hash of hashes.
Your return hash would point to another hash. The sub hash would have three keys, corpid, ou and o. Then you could call
to only get the ou field.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.