Original: The hurricane weakened as an approaching trough increased shear over the storm; this same trough also turned the storm north on the September 13, where it made landfall as a minimal hurricane on Baja California that day.
Simplified: The hurricane weakened as an approaching trough increased shear over the storm; this same trough also turned the storm north on the 13th, where it made landfall as a minimal hurricane Baja California that day.