The knowledge acquired through understanding of verbal and written sentences etc, are termed as Sruta Jnana.

She finished her written sentence.

Sruta Jnana Acquired through understanding of verbal and written sentences.

But it would be a mistake to suppose that a written sentence has no phonology.

In English and many other languages, the first word of a written sentence has a capital letter.

Ken, studying Nangi's cane as if it were a written sentence to be parsed, abruptly inclined his head.

This means that a written sentence can be longer than a spoken sentence.

He felt his eyes constantly drawn towards it as if it were a potent symbol, a written sentence of life.

He spoke very slowly, as if he were composing a written sentence, complete with punctuation, in his mind's eye.

There is no absolute limit on the length of a written English sentence.