Complex sentence: William Banting ("c." December 1796--16 March 1878), was a formerly obese English undertaker who was the first to popularise a weight loss diet based on limiting intake of refined and easily digestible carbohydrates.
Split into simpler sentences: William Banting ("c." December 1796--16 March 1878), was notable English undertaker. Formerly suffering from obesity, he is also known for being the first to popularise a weight loss diet based on limiting intake of refined and easily digestible carbohydrates.