Complex sentence: After the storm, the American Red Cross opened storm shelters for residents forced out of their homes because of the flooding and President Jimmy Carter also declared eastern Texas a disaster area making the state eligible for federal aid.
Split into simpler sentences: After the storm, the American Red Cross opened storm shelters for residents forced out of their homes because of the flooding. In addition, then President of the United States Jimmy Carter declared eastern Texas a disaster area making the state eligible for federal aid.