There were no punctuation marks in ancient times. How to break sentences depends entirely on the teacher's professor and his own understanding. "Judgment" refers to the exhaustion of meaning and the end of expression, which is called "sentence"; "Pause" refers to the place where the meaning has not been finished and you need to pause halfway, which is called "reading (teasing)".
Later generations added periods (question marks or exclamation marks) to ancient books one by one according to the "pause of words", and added commas or pauses to the "pause", which formed the "ancient prose" we read today. However, there are also some uncommon ancient prose without punctuation, which requires readers to understand by themselves according to the rule of "sentence reading".