Although the note on the question suggests the imperfect of Poder I think the translation should use the conditional, Podría rather than podía
we could also say as you suggest
This is also grammatically correct, but the meaning is different. With "podría" we are expressing a hypothetical situation: "he could share it, that is a possibility", but with:
what we mean is "he actually could/was able to" - a past action, not hypothetical.
Here is a lesson that explains this meaning of a hypothetical "could" in Spanish. Have a look here.
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