Learn Turkish: Kadın, izleri gizlice sildiğini inkâr etti. - The woman denied that she secretly deleted the traces.

This is the factive complement clause from the current lesson! It combines the verb sil (delete) with the suffix -dik (which softens to -diğ). Then we add the 3rd person possessive -in to mean 'her deleting' (that she deleted). Finally, the accusative case -i is added at the very end because this entire clause acts as the direct object of the main verb, inkâr etti (denied).

Both izleri and sildiğini end with the accusative suffix -i. Why are there two accusative words?

They belong to different verbs! izleri (the traces) is the specific direct object of the verb inside the clause, silmek (to delete). Meanwhile, sildiğini (that she deleted) is the direct object of the main verb in the sentence, inkâr etti (denied). Each verb gets its own object in the sentence.

There is no o (she) in the Turkish sentence. How do we know it means 'that she deleted' and not someone else?

We know it was her deleting because of the 3rd person possessive suffix -in in sildiğini (literally 'her deleting'). While it could theoretically mean 'his deleting' or 'its deleting', the context implies it refers back to the subject of the main sentence, Kadın (The woman). If it was someone else, the sentence would likely specify the person, like adamın sildiğini (that the man deleted).