Learn Turkish: Sayesinde kaynağı bulduğumuz dipnotu kaybettim. - I lost the footnote thanks to which we found the source.

When creating a relative clause with a postposition, Turkish uses the postposition in its 3rd-person form with a possessive suffix. Sayesinde means "thanks to it". It sits inside the relative clause acting as a placeholder for the noun being described (dipnot). The literal structure is: [thanks to it] + [the source] + [that we found] + [the footnote].

Why is sayesinde placed at the very beginning of the sentence rather than next to dipnotu?

Relative clauses in Turkish keep the word order of a standard sentence. If this were an independent sentence, you would say Sayesinde kaynağı bulduk (Thanks to it, we found the source). To turn this whole phrase into an adjective describing the footnote, you simply change the verb to bulduğumuz and place the target noun (dipnotu) right after it.

Why are both kaynağı and dipnotu in the accusative case?

Because they are direct objects belonging to two different verbs. Kaynağı (the source) is the object of the verb inside the relative clause, bulduğumuz (that we found). Meanwhile, dipnotu (the footnote) is the object of the main verb at the end of the sentence, kaybettim (I lost).

What is the literal breakdown of the word sayesinde?