Complex sentence: Fifi maintained its peak intensity for roughly 24 hours until it began to weaken shortly before making landfall near La Placenia, Belize with winds of 105 mph (165 km/h).
Split into simpler sentences: Fifi maintained its peak intensity for roughly 24 hours before weakening. This occurred shortly before the hurricane made landfall near La Placenia, Belize with winds of 105 mph (165 km/h).