～一方(で) — On One Hand, On the Other

兄は活発な一方で、弟はとても静かだ。

Ani wa kappatsu na ippou de, otouto wa totemo shizuka da.

While my older brother is lively, my younger brother is very quiet.

な-adj 活発 + な + 一方で sets up a contrast between the two siblings.

この仕事は給料がいい一方で、残業が多い。

Kono shigoto wa kyuuryou ga ii ippou de, zangyou ga ooi.

This job pays well, but on the other hand there is a lot of overtime.

い-adj いい + 一方で contrasts a good point with a bad point of the same job.

彼は会社を経営する一方で、大学でも教えている。

Kare wa kaisha o keiei suru ippou de, daigaku de mo oshiete iru.

He runs a company while also teaching at a university.

Verb 経営する + 一方で shows two parallel roles held at the same time.