صَارَ commonly expresses that someone or something became different.
صَارَ الْفَقِيرُ غَنِيًّا
- الْفَقِيرُ: marfu ism
- غَنِيًّا: mansub khabar
A simple practice example is صَارَ الطِّفْلُ قَوِيًّا: the child became strong. In this sentence, الطِّفْلُ is the ism, and the new state قَوِيًّا is the khabar.