Complex sentence: The Audion is an electronic amplifier device invented by Lee De Forest in 1906, the forerunner of what is generally known as a triode today, in which the flow of current from the filament to the plate was controlled by a third element, the grid.
Split into simpler sentences: The Audion is an electronic amplifier device invented by Lee De Forest in 1906. It was the forerunner of what is generally known as a triode today, in which the flow of current from the filament to the plate was controlled by a third element, the grid.