Complex sentence: Mortality may be as a consequence of primary viral infection or secondary problems such as bacterial infections and predisposition such as due to malnutrition or other deficiencies may further elevate the chances of death.
Split into simpler sentences: Mortality may be as a consequence of primary viral infection or secondary problems such as bacterial infections. Predisposition such as due to malnutrition or other deficiencies may further elevate the chances of death.