Complex sentence: Carl Kellner (1 September 1851--June 7,1905) was a wealthy chemist, inventor, industrialist, and putative founder of Ordo Templi Orientis.
Split into simpler sentences: Carl Kellner (1 September 1851--June 7,1905) was a chemist, inventor and industrialist. He was the putative founder of Ordo Templi Orientis.