Complex sentence: The Hanoverian tower, more commonly known as the Naze Tower, at the start of the open area of the Naze was a sea mark to assist ships on this otherwise fairly feature-less coast.
Split into simpler sentences: The Hanoverian tower, more commonly known as the Naze Tower, is situated at the start of the open area of the Naze. It was a navigational tower, constructed to assist ships on this otherwise fairly feature-less coast.