Complex sentence: Ludwig later extended its use to the music of Guillaume de Machaut, and Heinrich Besseler and other musicologists expanded its use further as an organizing structural element in 14th and early 15th-century compositions--in particular, motets.
Split into simpler sentences: Ludwig later extended its use to the music of Guillaume de Machaut. Subsequently, Heinrich Besseler and other musicologists expanded its scope further as an organizing structural element in 14th and early 15th-century compositions--in particular, motets.