。
She gave up her seat to the old person.
Literal
She [topic-は] old-person [to-に] seat [object-を] yielded.
席を譲る (せきをゆずる) is a set expression meaning 'to give up one's seat.' 譲る carries a nuance of willing, generous yielding — not reluctant surrender. This is a commonly referenced act of courtesy in Japanese society, especially on trains and buses.