Complex sentence: There is a story about a fisherman who sailed a boat to catch fish near the island, he said that he saw a human shadow waving a hand and yelling out something to him, so he sailed the boat to the island, but there was nothing.
Split into simpler sentences: There is a story about a fisherman who sailed a boat to catch fish near the island. He said that he saw a human shadow waving a hand and yelling out something to him, so he sailed the boat to the island, but there was nothing.