Complex sentence: President Obama declared a major disaster in the state, ordering federal aid to the affected areas: Cleveland, Lincoln, McClain, Oklahoma, and Pottawatomie; funding for hazard mitigation measures was included in the declaration to be made available statewide.
Split into simpler sentences: President Obama declared a major disaster in the state, ordering federal aid to the affected areas. The specified counties were Cleveland, Lincoln, McClain, Oklahoma, and Pottawatomie, with funding for hazard mitigation measures available statewide.