。
I hate seeing food go to waste.
Literal
Food [subject-が] waste become [nominalizer-のを] see [nominalizer-のは] unpleasant.
Nests two nominalizers: 無駄になるのを (the act of becoming waste) inside 見るのは (the act of seeing). いやだ expresses personal displeasure. A structurally instructive sentence.