Complex sentence: In 2008, AFP circulated the "No Climate Tax Pledge" to government officials at the federal, state, and local levels, a pledge to oppose any legislation including spending relating to climate change unless it also included an equivalent amount of tax cuts.
Split into simpler sentences: In 2008, AFP circulated the "No Climate Tax Pledge" to government officials at the federal, state, and local levels. Elected officials and political candidates who signed the pledge vowed to oppose any legislation including spending relating to climate change unless it also included an equivalent amount of tax cuts.