The sentence doesn't read smoothly.

句子不通顺。

《新英汉大辞典》

Just change one or two words and the sentence will read smoothly.

这句话只要动一两个字就顺了。

《新英汉大辞典》

The sentence is too long to read smoothly.

句子太长，念起来拗口。

youdao

But the plot moves so quickly and smoothly that I read it in a fraction of the time it took to complete his last novel, the slightly shorter (but much heavier) Anathem.

FORBES: Connect