Complex sentence: This followed the May 2008 reporting of the cover image on Wikipedia by U.S.-based social conservative site "WorldNetDaily" to the Federal Bureau of Investigation; however, a subsequent investigation by the FBI concluded that the artwork did not violate any US laws.
Split into simpler sentences: This followed the May 2008 reporting of the cover image on Wikipedia by U.S.-based social conservative site "WorldNetDaily" to the Federal Bureau of Investigation. A subsequent investigation by the FBI concluded that the artwork did not violate any US laws.