。
The famous pianist smiled.
Literal
Famous-[attributive-な] pianist [topic-は] smile-[polite-past-ました].
微笑む ('to smile faintly, to smile softly') is a deliberate, gentle word — more restrained than 笑う ('laugh, smile broadly'). The choice of verb matters here: 微笑む is the quiet, dignified smile of a professional musician, not a laugh. A small vocabulary distinction with outsized nuance.