Complex sentence: However, on October 2, a low-level circulation was noted on satellite imagery, which quickly became better defined over the next several hours while located 400 miles (644 km) south of Acapulco, Mexico.
Split into simpler sentences: However, on October 2, a low-level circulation was noted on satellite imagery. This circulation quickly became better defined over the next several hours while located 400 miles (645 km) south of Acapulco, Mexico.