Complex sentence: Abdominal obesity is positively associated with coronary heart disease risk in women and men, and has been hypothesized that the sex differences in fat distribution may explain the sex difference in coronary heart disease risk.
Split into simpler sentences: Abdominal obesity is positively associated with coronary heart disease risk in women and men. It has been hypothesized that the sex differences in fat distribution may explain the sex difference in coronary heart disease risk.