Complex sentence: The ocean's current name was bestowed by Portuguese explorer Ferdinand Magellan during the Spanish expedition of world circumnavigation in 1521, who encountered favourable winds as he reached the ocean and called it "Mar Pacifico" in Portuguese, meaning "peaceful sea".
Split into simpler sentences: The ocean's current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish expedition of the world in 1521, as he encountered favourable winds on reaching the ocean. He therefore called it "Mar Pacifico" in Portuguese, meaning "peaceful sea".