Complex sentence: The cello's eight throbbing notes are no mere introduction; they reappear at critical junctures throughout the movement, including at the beginning of the development and recapitulation sections, illustrating that they are part of the movement's primary thematic material.
Split into simpler sentences: The cello's eight throbbing notes are no mere introduction. They reappear at critical junctures throughout the movement, including at the beginning of the development and recapitulation sections, illustrating that they are part of the movement's primary thematic material.