Complex sentence: Brian Leigh Maxwell (1953, London, England--March 19,2004, San Anselmo, California) was a Canadian athlete, track coach, entrepreneur and philanthropist, was the founder of PowerBar, a maker of energy and nutritional products for athletes.
Split into simpler sentences: Brian Leigh Maxwell (1953, London, England--March 19,2004, San Anselmo, California) was a Canadian athlete, track coach, entrepreneur and philanthropist. He founded PowerBar, a maker of energy and nutritional products for athletes.