。
My mother made me a new dress.
Literal
Mother [topic-は] me [for-に] new dress [object-を] made-[benefactive-polite-てくれました]
つくって is the hiragana spelling of 作って. ~てくれました is the polite version of ~てくれた — an option when speaking about one's family in a polite register, e.g. to outsiders or in formal contexts.