Complex sentence: He tells Carol, who has relatives in Chicago, that he has been unable to reach any station east of Keokuk, Iowa, and another operator said an errant bomb hit Yosemite National Park because trees and rocks are falling from the sky.
Split into simpler sentences: He tells Carol, who has relatives in Chicago, that he has been unable to reach any station east of Keokuk, Iowa. Another radio operator said an errant bomb hit Yosemite National Park, causing trees and rocks to fall from the sky.