Complex sentence: The interior of the sleeve displays the covers of the albums (or most of them) from which the tracks are taken are shown, against the background of an incoming sea tide, with a family walking across the sands, in a washed-out monochrome.
Split into simpler sentences: The interior of the sleeve displays the covers of most of the albums from which the tracks are taken against the background of an incoming sea tide. This background features a family walking across the sands in a washed-out monochrome.