The Revolution only ended with the death of the leader, Ji Tai, after whom, Pol Zara, took over the leadership in 1978.
Is this sentence grammatically correct?
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The Revolution only ended with the death of the leader, Ji Tai, after whom Pol Zara took over the leadership in 1978.
Take out the commas before and after Pol Zara and this looks and sounds right. Ji Tai gets commas because he substitutes the phrase "the leader", but Pol Zara does not because he does not substitute anything.
As for the meaning, I assumed that after the revolution had ended with said death, Zara, related or not, came under leadership whether the revolution had succeeded or not. I'm assuming it had not.