Complex sentence: There will sometimes be points where the ("x ","y ") coordinates are close but their"d" values are far apart, as is inevitable when mapping from a 2D space to a 1D space.
Split into simpler sentences: There will sometimes be points where the ("x ","y ") coordinates are close but their"d" values are far apart. This is inevitable when mapping from a 2D space to a 1D space.