Complex sentence: It is not the deepest canyon in the world (Kali Gandaki Gorge in Nepal is far deeper), however, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape.
Split into simpler sentences: It is not the deepest canyon in the world (Kali Gandaki Gorge in Nepal is much deeper). However, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape.