Learn Turkish: Döviz bozdurdum ve aldığımı bankaya yatırdım. - I exchanged foreign currency and deposited what I received to the bank.

aldığımı is built from the verb almak (to get/receive) + the object participle suffix -dık + the first-person possessive -ım (my). Normally, this would act as an adjective before a noun, like in aldığım para (the money that I received). Here, the noun is omitted (substantivized), so aldığım stands on its own to mean "the thing that I received" or "what I received".

Why is there an extra -ı at the very end of aldığımı?

That final -ı is the accusative case marker. Because the "headless" participle aldığım (what I received) is functioning as a noun, it can take case endings just like any normal noun. It takes the accusative case here because it is the specific direct object of the verb yatırdım (I deposited).

Why use bozdurdum instead of just bozdum for exchanging currency?

The base verb bozmak means "to break" or "to ruin" (and by extension, to break a large bill into smaller ones). However, when you exchange foreign currency, you are technically having a teller or exchange office do it for you. Adding the causative suffix -dur creates bozdurmak (to have something changed/exchanged), which is the standard verb for this action in Turkish.

Where does the word yatırdım (I deposited) come from?