Complex sentence: The human voice (the song proceeds) cannot express so sweetly what is inmost, in such a'song seraphically free Of taint of personality', in which' millions rejoice For giving their one spirit voice.
Split into simpler sentences: The human voice (the song proceeds) cannot express so sweetly what is inmost. It has not such a'song seraphically free Of taint of personality'; a voice in which' millions rejoice For giving their one spirit voice.