Complex sentence: Motifs are often used to classify literary works and works from the oral tradition, notably in the work of folklorists Antti Aarne and Stith Thompson, which is currently undergoing revision by Hans-Jörg Uther.
Split into simpler sentences: Motifs are often used to classify literary works and works from the oral tradition. Most notably, perhaps, this was done in the classification system developed by folklorists Antti Aarne and Stith Thompson, which is currently undergoing revision by Hans-Jörg Uther.