Complex sentence: At this average distance, light travels from the Sun's horizon to Earth's horizon in about 8 minutes and 19 seconds, while light from the closest points of the Sun and Earth takes about two seconds less.
Split into simpler sentences: At this average distance, light travels from the Sun's horizon to Earth's horizon in about 8 minutes and 19 seconds. Light from the closest points of the Sun and Earth takes about two seconds less.