Shopclass Theme Remove Sitename from TİTTLE of items

Shopclass Theme; Remove Sitename from TİTTLE of items and add SİTENAME behind of categories.
Currently I use shopclass theme and it is auto inserting SİTENAME behind of each items. I need to remove it because title lenght exceed 65 characters.

Also I want to add ( auto insert ) SİTENAME behind of categories and subcategories…
How can I do that?