Complex sentence: AMBA accredits approximately 2% of the world's business schools, and is the most international of the three organisations having accredited schools headquartered in 54 countries, compared with the 52 for AACSB and 38 for EQUIS.
Split into simpler sentences: AMBA accredits approximately 2% of the world's business schools. AMBA is the most international of the three organisations, having accredited schools headquartered in 54 countries, compared with the 52 for AACSB and 38 for EQUIS.