Before revision: Capote, who wrote Breakfast of Tiffany's in the late 1950s, probably did not realize the behavior he ascribed to Holly was previously known as treating, as by then the earlier language used to describe the activity had largely disappeared from the American vernacular.
After revision: Capote, who wrote Breakfast at Tiffany's in the late 1950s, probably did not realize the behavior he ascribed to Holly was previously known as treating, as by then the earlier language used to describe the activity had largely disappeared from the American vernacular.