Sentence:  thanks to the rhythma, / "in dividing correctly" / "many simple <WSD>quadrals</WSD>," / "in more involved sentences" / our arrangement shows regularly / these simple <WSD>quadrals</WSD> / expanding into "periods," 
Meaning of the word marked with <WSD> tags:  A set of four phrases, separated by pauses when speaking or commas when writing.