Complex sentence: DVR adoption has rapidly accelerated in recent years: in January 2006, AC Nielsen recorded 1.2% of US households having a DVR but by February 2011, this number had accelerated to 42.2% of viewers in the United States.
Split into simpler sentences: DVR adoption has rapidly accelerated in recent years: in January 2006, AC Nielsen recorded 1.2% of US households having a DVR. By February 2011, this number had accelerated to 42.2% of viewers in the United States.