となると
to naruto

Expression

1. when it comes to ...; where ... is concerned

アインシュタインにとって理論 りろん物理 ぶつり がく あそびのようなものだったが、そんな かれ税金 ぜいきん計算 けいさんとなるとからきし駄目 だめだった。
ainshutainni totte rirombutsurigakuwa asobino yōna monodattaga sonna karemo zēkinno kēsanto naruto karakishi damedatta.
Theoretical physics was child's play to Einstein, but he couldn't figure out his income tax.
Conjunction
Expression

2. if it's the case that ...; if it turns out that ...; if it's true that ...; in that case