Complex sentence: Students who completed these requirements in 4 years of high school were permitted to graduate; this practice was known as fast-tracking, finishing Grade 12 in four years with 30 credits if the student was college bound.
Split into simpler sentences: Students who completed these requirements in 4 years of high school were permitted to graduate; this practice was known as fast-tracking. Finishing Grade 12 in four years with 30 credits if the student was college bound.