Complex sentence: Ong graduated with distinctions from The Chinese High School (now Hwa Chong Institution) in 1955, but being Chinese-educated, he saw little opportunity for advancing his studies in the University of Malaya, as English was the university's language medium.
Split into simpler sentences: Ong graduated with distinctions from The Chinese High School (now Hwa Chong Institution) in 1955. Having received a Chinese-language education, he saw little opportunity for advancing his studies in the University of Malaya, as English was the university's language medium.