Most likely is the code similar to:
Code:
zen_break_string(nl2br(zen_output_string_protected(stripslashes($review_info->fields['reviews_text']))), 60, '-<br />')
What this is doing is breaking the text at 60 characters with '-<br />' and that adds the - then the break ...

You can remove the hyphen so that these longer lines do not get the hyphen added ... and you can adjust the 60 to a longer length if it fits your layout ...