Complex sentence: The chamber is renowed for there Mackinac Public Policy conference which is held annual on Mackinac Island at the Grand Hotel, this conference is generally considered the best confernce of it's kind in the country.
Split into simpler sentences: The Chamber is renowned for their Mackinac Public Policy conference which is held annually on Mackinac Island at the Grand Hotel. This conference is generally considered the best conference of it's kind in the country.