Complex sentence: By midday, Hurricane Hunters recorded a pressure of as the eye became visible on infrared satellite imagery, prompting the EPHC to upgrade Liza to a major hurricane, a Category 3 or higher on the SSHS.
Split into simpler sentences: By midday, Hurricane Hunters recorded a pressure of as the eye finally became visible on infrared satellite imagery. Around this time, the EPHC upgraded the hurricane into a major hurricane, a Category 3 or higher on the SSHS.