He will be reinstated as head of behavior now that Teresa's manipulations have come to light.
to give back a job or position that had been taken away from sb
★ 例句1：He was reinstated in his post.
now that表示 “既然” ， 同since相似，语气较弱，但now that必须引出一个新的情况。
You use now that to give an explanation of a new situation:
★ 例句1：Now that everyone is here let's start work．
★ 例句2：Now that you've seen the house, I'll show you the grounds.
to become known to people
★ 例句1：New evidence has recently come to light.
★ 例句2：It has come to light that he was lying.
★ 例句3：Nothing about this sum has come to light.