Complex sentence: In 1849, William F. Martin built one of the first hotels in the Adirondacks--the Saranac Lake House, known simply as "Martin's"--on the southeast shore of Lower Saranac Lake.
Split into simpler sentences: In 1849, William F. Martin built one of the first hotels in the Adirondack Mountains. His Saranac Lake House, known simply as "Martin's", was located on the southeast shore of Lower Saranac Lake.