Complex sentence: FPU already has the highest four-year graduation rate in the Central Valley, with 51 percent of traditional undergraduate students already graduating in four years, compared to 12-15 percent in the CSU system.
Split into simpler sentences: FPU already has the highest four-year graduation rate in the Central Valley. Fifty one percent of traditional undergraduate students already graduate in 4 years in comparison to 12-15 percent in the CSU system.