You can update the template for the email that you are using to get rid of the first part of the fields name. In the webassist > email > templates look for your template file then open it up and find the following piece of code with cmd+f:
php:
<?php echo(str_replace("_"," ",$pkey)); ?>
update this code to be like this instead:
php:
<?php echo(str_replace("fieldset group ", "", str_replace("_"," ",$pkey))); ?>
I think this will get rid of the name of the form element from the message body for you. Give this a try and let us know if you have any other troubles with it.
