Complex sentence: This lighthouse of one of six Imperial Towers built in the 1850s on Lake Huron and Georgian Bay; all were made of cut limestone and granite, not the more typical brick, metal, wood or concrete.
Split into simpler sentences: This lighthouse of one of six Imperial Towers built in the 1850s on Lake Huron and Georgian Bay. All were made of cut limestone and granite, not the more typical brick, metal, wood or concrete.