Complex sentence: The Kilowatt was a predecessor to more recent battery electric vehicles such as the General Motors EV1 as well as modern electric hybrid vehicles which use a gasoline-powered internal combusion engine in addition to an electric propulsion system.
Split into simpler sentences: The Kilowatt was a predecessor to more recent battery electric vehicles such as the General Motors EV1. The electric propulsion technology developed for the Henney Kilowatt also contributed to the development of modern electric hybrid vehicles which use a gasoline-powered internal combusion engine in addition to an electric propulsion system.