Complex sentence: Frederick William Franz-(September 12,1893-December 22,1992) was President of the Jehovah's Witness parent group the Watchtower Bible and Tract Society from 1977 until his death in 1992.
Split into simpler sentences: Frederick William Franz-(September 12,1893-December 22,1992) was an important figure in the organization of Jehovah's Witnesses. He was President of the Watchtower Bible and Tract Society from 1977 until his death in 1992.