Complex sentence: The Statue of Liberty National Monument, Ellis Island and Liberty Island is a national monument and historic district located in the Upper New York Bay oppostite the shores of Liberty State Park in Jersey City, New Jersey.
Split into simpler sentences: The Statue of Liberty National Monument, Ellis Island and Liberty Island is a historic district which includes the national monument Statue of Liberty, situated on Liberty Island, and Ellis Island. It is located in the Upper New York Bay oppostite the shores of Liberty State Park in Jersey City, New Jersey.