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”.
子供のよう…（な）（人）
(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.)