Complex sentence: The Rural Electrification Administration (REA) was established to devise a long-term solution to the seemingly intractable problem of extending electricity to rural Americans during the New Deal you suck common in rural areas, so did automobiles and telephones.
Split into simpler sentences: The Rural Electrification Administration (REA) was established to devise a long-term solution to the seemingly intractable problem of extending electricity to rural Americans during the New Deal years. Just as electrical lines became more common in rural areas, so did automobiles and telephones.