While the participants in that study were younger (7 to 9+ years old), the study is relevant because the challenges those young participants face, are faced again when readers of any age encounter new and complicated texts that present words they do not know, and ideas they have never considered.
there is ample work on the basic algorithm to place a sequence of words in a typesetting area with a certain width, commonly known as the optimal line breaking problem (e.g., , Knuth and Plass (1981)).