Complex sentence: At foundation level, 7.5 percent of candidates received an A-grade and 72 percent received a C-grade or higher, while 20 percent received a D-grade and 7.7 percent failed.
Split into simpler sentences: At foundation level, 7.5 percent of candidates received an A-grade and 72 percent received a C-grade or higher. Twenty percent received a D-grade and 7.7 percent failed.