I am working as a childcare worker at the kindergarten where I graduated from.
I received great education there, and I would like to give back what they gave me.
Also, I want to educate the children there with the same care that I received, so that is why I am working at my alma mater.
ご質問ありがとうございます。
"I am working as a childcare worker"＝「私は保育士として働いています」
"at the kindergarten where I graduated from."＝「私が卒業した幼稚園で。」
"I received great education there,"＝「私はそこで素晴らしい教育を受けました」
"and I would like to give back what they gave me."＝「そして私はその恩返しをしたいです。」
"Also, I want to educate the children there"＝「そして私はそこの子供たちを教育したいです」
"with the same care that I received,"＝「私が受けた大切なケアと同じく」
"so that is why I am working at my alma mater."＝「なので私は母校で働いています。」
ご参考に。
アメリカ合衆国 
