ambiguous sentence

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"By the late nineteenth century a still widespread respect for brähmanas was

increasingly overshadowed by growing awareness of the evils of the

unmalleable and exploitive caste system, for which brähmanas, as its

principle beneficiaries, were largely held culpable."

 

'Culpable' refers to 'evils,' so 'which' ambiguously refers to both 'evils'

and 'exploitive caste system.'

 

How should this be rewritten?

 

Flummoxed, BVS