。
My mother bought me a new dress.
Literal
Mother [topic-は] me [for-に] new dress [object-を] bought-[benefactive-てくれた]
買ってくれた combines 買う ('buy') with the benefactive auxiliary ~てくれる, marking the action as done for the speaker's benefit. The benefactive lights up the giving/receiving system: ~てくれる is used when an in-group member (here, my mother) does something for me; ~てあげる goes the other way (I do for someone else); ~てもらう has the speaker as recipient framed as 'received the favor of.' 私に marks the recipient. Compact, warm, and a model sentence for learning the kureru-side of the system.