The data shown appear to be from an LDIF file, so I'm guessing you want to read from the file rather than from an LDAP server. The steps would be:

1. Open and read LDIF file
2. Manipulate data
3. Write CSV file

I recommend using Net::LDAP::LDIF and Text::CSV_XS.

Once you have some code written people here will be happy to help you debug it.