영어 문장에서 생략된 표현 설명 부탁드려요

Teaching music is also a passion for my dad.
Not known to many, he scheduled twice a week a session for music amateurs who wanted to learn how to play guitars without charging a single cent.
여기서 Not known to many를 아이들에게 어떻게 설명하면 좋을까요?

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