。
She waited for him patiently.
Literal
She [topic-は] patiently him [object-を] waited.
辛抱強い (しんぼうづよい) is a compound adjective: 辛抱 ('endurance, perseverance') + 強い ('strong'). The く-form 辛抱強く functions as an adverb. This ~強い suffix is productive for positive personality traits: 我慢強い ('persevering'), 粘り強い ('tenacious'), 忍耐強い ('patient'). Note that 待つ takes its object with を — 彼を待った ('waited for him').