Complex sentence: He comes upon a brook, which he follows to a mill. He falls in love with the beautiful miller's daughter (the "Müllerin" of the title); she is out of his reach as he is only a journeyman.
Split into simpler sentences: He comes upon a brook, which he follows to a mill. He falls in love with the beautiful miller's daughter (the "Müllerin" of the title). She is out of his reach as he is only a journeyman.