A plain form adjective or verb. or a noun + の followed by the na-adjective よう functions as a な adjective meaning “similar to what is described by the predicate”.

(A person who is)… like a child

みんなが分かるよう (な)(言葉)
The kind of words that everybody can understand.

見えるよう (に) (部屋が広いです。)
As you can see, (the room is big.)