Complex sentence: He was nephew of Caroline Amalie, Queen Consort of Denmark, and thus "nephew-in-law" of the King Christian VIII of Denmark himself, as well as a great-nephew of Frederick VI.
Split into simpler sentences: He was nephew of Caroline Amalie, Queen Consort of Denmark, and thus "nephew-in-law" of the King Christian VIII of Denmark himself. As well as a great-nephew of Frederick VI.