She had five children.

Literal

She [topic-は] children [object-を] five-people gave-birth-to.

A tidy example of Japanese 'floating quantifiers': the count 5人 sits between particle and verb rather than attaching to the noun like English 'five children.' The pattern [noun][を][number][counter] verb is extremely common — 卵を3個食べた ('I ate three eggs'), 本を2冊買った ('I bought two books'). 産む ('to give birth to, bear') is the biological verb, distinct from the broader 生む ('to produce, bear, bring forth'); the kanji split is a reading nicety more than a meaning split. 人 is the obligatory counter for people — Japanese will not let you count without one.