Complex sentence: At that time RIM had played around with a similar functionality, calling it "virtual target emulation"; it was supposed to be available through the BB7 operating system, which was run by the Blackberry Bold 9900 device.
Split into simpler sentences: At that time RIM had played around with a similar functionality. They referred to it as "virtual target emulation"; it was supposed to be available through their BB7 OS which was run by the Blackberry Bold 9900 device.