Complex sentence: The superheterodyne, invented in 1918 during World War 1 by Edwin Armstrong when he was in the Signal Corps, is the design used in almost all modern receivers, except a few very inexpensive low-parts-count applications.
Split into simpler sentences: The superheterodyne, invented in 1918 during World War 1 by Edwin Armstrong when he was in the Signal Corps, is the design used in almost all modern receivers. The "superhet" is now used in almost all receivers, except a few very inexpensive low-parts-count applications.