How did the ancient Chinese break sentences?

The content of the book is mainly about Christian teachings, but also about world history, folklore, astronomy, and other aspects. In addition, the Ch'ai Shih Ch'ai monthly tung-ch'ien also introduced the Western punctuation system into the Chinese language, not only with sentence breaks, including "、" "、," "、" and "求求" for geographical names and personal names. and the special symbol for geographical and personal names "求求" were used. Although there was no punctuation in the books and articles of the ancients, there was "sentence reading" (jv dou), and when private school teachers taught their students, they used a red pen to break sentences, so that after their level of proficiency was raised, they could read through the articles without the need for sentence reading. Generally a bit of culture, also gradually adapted to this reading method. That is, it did not affect the development of ancient culture, but is not conducive to popularization.