Because a stock split restates the historical basis of the original shares, you will need to adjust the price per share based on the split ratio and report the same number of shares purchased as sold. You don't need to enter every detail of the transaction, as long as your summary entries are accurate.
Please see this excellent discussion by Tom Young: How to enter ESPP Stock Sale with Multiple Lots and Splits. Be sure to read the original poster's info as well.
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