Complex sentence: In North America, the term "subcompact" came into popular use in the early 1970s with the introduction of new domestic-built models produced by North American automakers in response to the growing popularity of small imported cars from Europe and Japan.
Split into simpler sentences: In North America, the term "subcompact" came into popular use in the early 1970s. The subcompact market segment expanded in the 1970s with the introduction of new domestic-built models produced by North American automakers in response to the growing popularity of small imported cars from Europe and Japan.