Complex sentence: John Reed sees the song as a forerunner to "Die Forelle", observing that "Die Erscheinung" and other similar songs, "convey an intensity of feeling that belies their small scale".
Split into simpler sentences: John Reed sees the song as a forerunner to "Die Forelle". Reed observes that "Die Erscheinung" and other similar songs, "convey an intensity of feeling that belies their small scale".