Complex sentence: Texturally, the piece is so constructed that the words are always clearly intelligible, something not always true in music of the period, and a specific criticism made by Savonarola of polyphonic music.
Split into simpler sentences: Texturally, the piece is so constructed that the words are always clearly intelligible. Intelligibility of sung text was not always a high priority for composers of the period, and this lack of intelligibility was a specific criticism Savonarola made of polyphonic music.