Complex sentence: The travelogues of the later nineteenth century in turn further contributed to the elaboration and propagation of the Great Wall myth, which eventually spouted claims like the Great Wall of China being visible from the Moon or Mars.
Split into simpler sentences: The travelogues of the later 19th century in turn further contributed to the elaboration and propagation of the Great Wall myth. Examples of this myth's growth are the false but widespread belief that the Great Wall of China is visible from the Moon or Mars.