Complex sentence: Any faint hope remaining for the Fertile Crescent Plan was squelched with the overthrow of the Iraqi monarchy in July 1958, however efforts to unite the Fertile Crescent states continue to exist.
Split into simpler sentences: Any faint hope remaining for the Fertile Crescent Plan was squelched with the overthrow of the Iraqi monarchy in July 1958. Efforts to unite the Fertile Crescent states continue to exist.