Complex sentence: Adaptive design uses multiple page layouts for a single web page and sometimes Progressive enhancement PE, the Adaptive model is a "Mobile Separate" layout, in contrast to "Mobile First", unobtrusive JavaScript, and progressive enhancement of Responsive web design (RWD).
Split into simpler sentences: Adaptive design uses multiple page layouts for a single web page and sometimes Progressive enhancement (PE). The Adaptive model is a "Mobile Separate" layout, in contrast to "Mobile First", unobtrusive JavaScript, and progressive enhancement of Responsive web design (RWD).