Complex sentence: He was assassinated when in a brazen noonday attack on Mexico City's busy beltway, assailants unloaded a machine gun at the moving car of a popular television host, killing him and wounding at least five others.
Split into simpler sentences: He was assassinated in a brazen, noonday attack on Mexico City's busy beltway. The assailants unloaded a machine gun at his moving car, killing him and wounding at least five others.