Complex sentence: In 1996 Sharp HealthCare changed ownership and broke off its relationship with Chopra, who then went on, with neurologist David Simon (1951--2012), to found the Chopra Center for Wellbeing at the Omni La Costa Resort and Spa in Carlsbad, California.
Split into simpler sentences: In 1996 Sharp HealthCare changed ownership and broke off its relationship with Chopra. With neurologist David Simon, Chopra founded the Chopra Center for Wellbeing at the Omni La Costa Resort and Spa in Carlsbad, California.