仕事を生半可に知っている人が書くことは、できれば避けたい。

、。

I'd like to avoid having people who only half-understand the job write about it, if possible.

Literal

Job [object-を] superficially knowing person [subject-が] write thing [topic-は], if-possible want-to-avoid.

生半可に (superficially/half-heartedly) is a na-adjective used adverbially. The relative clause 仕事を生半可に知っている人 describes people with shallow knowledge. できれば (if possible) softens the wish. 避けたい (want to avoid) expresses a personal desire to maintain quality.