Complex sentence: It is a special honor to receive the last "aliyah" of the Book of Deuteronomy; the man receiving that aliyah is called the "Chatan Torah" (the groom of the Torah).
Split into simpler sentences: It is a special honor to receive the last "aliyah" of the Book of Deuteronomy. The man receiving that aliyah is called the "Chatan Torah" (the groom of the Torah).