Complex sentence: Lewiston is situated on the Niagara River, just across the river from Canada, and is half way between the world famous Niagara Falls and historic Fort Niagara in Youngstown, New York.
Split into simpler sentences: Lewiston is situated on the Niagara River, just across the river from Canada. It is half way between the world-famous Niagara Falls and historic Fort Niagara in Youngstown, New York.