Complex sentence: Near the coast of Africa, the first mate led a mutiny and left the pirate captain at sea in a small boat before bringing the ship back to Boston, Massachusetts, on 24 December 1859 and turning her over to authorities.
Split into simpler sentences: Near the coast of Africa, the first mate led a mutiny and left the pirate captain at sea in a small boat. He sailed the ship back to Boston, Massachusetts, arriving on 24 December 1859 and turning her over to authorities.