Complex sentence: Oklahoma initially experienced success with their tracking system, after implementation in 2006, as the number of seizures of dropped in that year and again 2007, but in 2008 however, seizures began rising again, and have continued to rise in 2009.
Split into simpler sentences: Oklahoma initially experienced success with their tracking system after implementation in 2006, as the number of seizures dropped in that year and again in 2007. However in 2008, seizures began rising again, and have continued to rise in 2009.