Original sentence: A comparison of their shape reveals that the structural strength of concrete made it possible to build the Roman pyramid at a much sharper angle than those of Egypt
Edited sentence: A comparison of their shape reveals that the structural strength of concrete made it possible to build the Roman pyramid at a much sharper angle than those of Egypt; while that in turn allowed the Pyramid of Cestius to reach a much greater height for the amount of building material involved, the more pointed shape is not as successful esthetically as that of the Egyptian pyramids