Complex sentence: First based in Singapore, later in Hong Kong, he was the regional representative of Heinemann Educational Books of London, later becoming managing director of local Heinemann subsidiary companies established in Hong Kong, Singapore and Kuala Lumpur.
Split into simpler sentences: First based in Singapore, later in Hong Kong, he was the regional representative of Heinemann Educational Books of London. He became managing director of local Heinemann subsidiary companies established in Hong Kong, Singapore and Kuala Lumpur.