Complex sentence: On September 21,2007, DirecTV-10 began broadcasting to customers channel 498 which confirms weather or not the B-Band Converter, a necessary component to the new HD technology employed by DirecTV, is functioning correctly.
Split into simpler sentences: On September 21,2007, DirecTV-10 began broadcasting to customers channel 498. This demonstrates whether or not the "B-Band Converter", a necessary component of the new HD technology employed by DirecTV, is functioning correctly.