Complex sentence: This is due to its eye replacing the old one and undergoing a minor eyewall replacement cycle, although the JTWC upgraded Phanfone to a category 4 again late on October 3.
Split into simpler sentences: This is due to its eye replacing the old one and undergoing a minor eyewall replacement cycle. Although the JTWC upgraded Phanfone to a category 4 again late on October 3.