。
She made the boy into a fine person.
Literal
She [topic-は] boy [object-を] fine person [into-に] made.
The pattern [A]を[B]にする means 'to make A into B, to turn A into B.' Here, she transformed the boy into 立派な人間 (りっぱなにんげん, 'a fine/admirable person'). 立派 describes something respectable and worthy of admiration — it covers character, achievements, or appearance.