Complex sentence: Murray obtained the aid of a Senate page and the Sergeant at Arms Dunning R. McNair, and as Sumner regained consciousness they were able to assist him to walk to a cloakroom.
Split into simpler sentences: Murray obtained the aid of a Senate page and the Sergeant at Arms, Dunning R. McNair. As Sumner regained consciousness they were able to assist him to walk to a cloakroom.