Complex sentence: The hijackers ordered the ship brought to Mona Island (Monkey Island), a small island in the eponymous passage between Puerto Rico and the Dominican Republic, where its captain and crew were ordered to unload the cargo.
Split into simpler sentences: The hijackers ordered that the ship was navigated to Mona Island (lit. "Monkey Island"), a small island located in the eponymous passage between Puerto Rico and the Dominican Republic. There its captain and crew were ordered to unload the cargo.