The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 268

p. 268

तन्मूलतो व्याकरणं व्याकरोतीति तत्तथा ॥

In plain words

Taking that as its root, it lays grammar out distinctly — so that is how it stands.

Close to the Sanskrit

From that as root it sets forth grammar distinctly — thus that is so.