Complex sentence: The third movement is slow, an example of what is often called Bartók's "Night music", and features timpani glissandi which was an unusual technique at the time of the work's composition, as well as a prominent part for the xylophone.
Split into simpler sentences: The third movement is slow, an example of what is often called Bartók's "Night music". It features timpani glissandi, which was an unusual technique at the time of the work's composition, as well as a prominent part for the xylophone.