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to divide; to separate; to partition; to demarcate; to delimit; to mark off
to punctuate; to mark off (with a comma); to insert pauses (between words or phrases when reading aloud); to space one's words
文章を意味のある単位で句切って読んだ。
She read the text by breaking it into meaningful units.
文章を適切な場所で句切ると読みやすい。
Text is easier to read when you break it at the right places.
句切るタイミングが分からず、棒読みになってしまった。
Not knowing where to pause, he ended up reading in a flat monotone.