Complex sentence: A USB device firmware hack called "BadUSB" was demonstrated at Black Hat USA 2014 conference; a USB flash drive microcontroller can be reprogrammed to spoof various other device types in order to take control of a computer, exfiltrate data, or spy the user.
Split into simpler sentences: A USB device firmware hack called "BadUSB" was demonstrated at Black Hat USA 2014 conference. As an example, a USB flash drive microcontroller can be reprogrammed to spoof various other device types in order to take control of a computer, exfiltrate data, or spy on the user.