Complex sentence: All darknets require specific software installed or network configurations made to access them, such as Tor which can be accessed via a customised browser from Vidalia, aka the Tor browser bundle or alternatively via a proxy server configured to perform the same function.
Split into simpler sentences: All darknets require specific software installed or network configurations made to access them, such as Tor, which can be accessed via a customized browser from Vidalia, aka the Tor browser bundle. Alternatively, the darknet can be accessed via a proxy server configured to perform the same function.