Complex sentence: Version 4.1.2 introduced a new type of BES, BlackBerry Enterprise Server for Applications, which as the name implies provides a secure wireless gateway for BlackBerry devices which does not require the device owner to possess an email account.
Split into simpler sentences: Version 4.1.2 introduced a new type of BES, BlackBerry Enterprise Server for Applications. This provides a secure wireless gateway for BlackBerry devices without requiring the device owner to possess an email account.