This is a bit of an indirect question related to this lesson about "aprés avoir fait".

The sentence used in the quiz is: "Lucette changea les draps aprés avoir fait le lit." This got me wondering about "changea" and what verb form it is, why we wouldn't say "Lucette a changé les draps aprés avoir fait le lit." But on further reading I see that this is just the difference between a form used in conversation French (passé composé - which perhaps most learners come across first) vs written French (passé simple - which learners come across later..?)

My other question is whether the sentence should actually read: "Aprés avoir changé les draps, Lucette fis / a fait le let." You change the sheets before making the bed, right?