Complex sentence: While approaching the Lesser Antilles, it became disorganized due to wind shear, but at 12:00 UTC on July 9, Chantal peaked with sustained winds of 65 mph (100 km/h).
Split into simpler sentences: While approaching the Lesser Antilles, it became disorganized due to wind shear. However, at 1200 UTC on July 9, Chantal peaked with sustained winds of 65 mph (100 km/h).