Complex sentence: He completed his secondary education and took the Senior Cambridge examination at Raffles Institution in the top class in 1929, where he was a classmate of David Marshall, the first Chief Minister of Singapore; they became good friends.
Split into simpler sentences: He completed his secondary education and took the Senior Cambridge examination at Raffles Institution in the top class in 1929. There, he was a classmate of David Marshall, the first Chief Minister of Singapore; they became good friends.