Complex sentence: Many people, however, have confused the name with the name Arwen from J. R. R. Tolkien's "The Lord of the Rings", which means "noble maiden" in Sindarin.
Split into simpler sentences: Many people, however, have confused the name with the name Arwen from J. R. R. Tolkien's "The Lord of the Rings". The name Arwen means "noble maiden" in Sindarin.