Complex sentence: Gran Canaria (originally meaning'Great (Island) of Dogs') is the second most populous island of the Canary Islands, a Spanish archipelago, with a population of 838,397 which constitutes approximately 40% of the population of the archipelago.
Split into simpler sentences: Gran Canaria (originally meaning'Great (Island) of Dogs') was the second most populous island of the Canary Islands, a Spanish archipelago, with a population of 838,397. It constitutes approximately 40% of the population of the archipelago.