Pluto wiki sentence

[mella]

I was trying to read the wiki article about Pluto manga. My grammar is still very poor. Could you help me to analyze this sentence?
作者の浦沢直樹が生まれて初めて漫画で感動した作品が、手塚治虫の『鉄腕アトム』のエピソードのひとつである「地上最大のロボット」であった
I know all this kanji, but I can only guess the meaning. Tk for your reply!

[kurisuto]

Do you know how relative clauses are formed? Could you provide your own translation first, and/or tell use what's bothering you in particular?