) No, it 'shouldn't'. It is fine as it is. ) Not redundancy; style.
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Stenka25I think 'was' should be put before the underlined 'replaced'.(Am I right?)No, it 'shouldn't'. It is fine as it is.
Stenka25But redundancy make this ellipsis of 'was' possible.(Am I right?)Not redundancy; style.
Stenka25... “aggressiveness was constrained and the old forms of primate dominance (were) replaced by complex social skills."were" is the ellipsis, not "was", but you've got the basic idea right. It's a matter of parallelism that makes "were" unnecessary.