Why does the author write the past perfect had discarded instead of the simple past discarded? Is it possible that the simple present tense and the past perfect tense are used in the same sentence?

But time and again, Simonton finds that they backtrack, returning to iterations that they had earlier discarded as inadequate.

Originals: How Non-conformists Change the World

  • 2
    There's no rule that the tense in all the verbs has to be the same. Do you think that there is such a rule?
    – James K
    Aug 30 at 6:41

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