Complex sentence: The bulk of the movie consists of commercials, shorts, and trailers for fictional movies that are usually not connected to one another, being shown as part of a Congressional Oversight Committee as a representative day of TunnelVision programming.
Split into simpler sentences: The bulk of the movie consists of commercials, shorts, and trailers for fictional movies that are usually not connected to one another. These are being shown during a Congressional Oversight Committee hearing as a representative day of TunnelVision programming.