Complex sentence: In 2010 Card stated in an interview that he had bought back the contract on the sequels, and does not know if he will ever finish the series, stating difficulties in writing, due to the timeline, as his reason.
Split into simpler sentences: In 2010 Card stated in an interview that he had bought back the contract on the sequels, and does not know if he will ever finish the series. Stating difficulties in writing, due to the timeline, as his reason.