当社の社員は期待される役割に応じ3つの等級に区分されるって英語でなんて言うの？

Employees are divided into three job-ranks depending on expected roles. は間違いませんがもっとはっきり言いたいと In this company, employees are divided into three different ranks depending on the role they are expected to take. In this company「当社で」はなくてもいけます。 employees are divided into three different ranks「社員は3つの等級に区分される」は "different" がある方は良いです。"job-rank" はあまり言われていないとおもいますが "rank" だけがあればいけます。 「期待される役割に応じ」に "depending on the role they are expected to take" の方が良いです。"expected role" と言えば「期待する役割」になってしまいます。

"Our employees are classified into three grades based on their expected roles." "Employees are divided into three levels according to their expected roles." "Our employees are grouped into three tiers depending on the roles expected of them." ・社員＝employees ・区分される＝are classified / are divided / are grouped ・3つの等級＝three grades / levels / tiers ・期待される役割に応じ＝based on / according to / depending on expected roles という要素で構成されます。