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diffraction is a superposition of a family of waves from a single slit..

then how the fringes formed during double slit experiment is actually a superposition of single-slit diffraction from each slit and the double-slit interference pattern ??

I read

"the broader diffraction peak is actually made of several fringes of smaller width due to double-slit interference and the number of interference fringes occurring in the broad diffraction peak depends on the ratio of the distance between the two slits to the width of a slit. in the limit of the width of the slit becoming very small, the interference pattern will become very flat and we will observe two slit interference pattern..."

somebody please explain..... I'm finding optics difficult to grasp... thanks in advance....