Complex sentence: The Bush tax cuts of 2001, which had been extended for two years by the 2010 Tax Relief Act, were to expire on December 31,2012, and planned spending cuts under the Budget Control Act of 2011 also came into play.
Split into simpler sentences: The Bush tax cuts of 2001, which had been extended for two years by the 2010 Tax Relief Act, were due to expire on December 31,2012. Planned spending cuts under the Budget Control Act of 2011 also came into play.