Complex sentence: At the time of his death, his estate was valued at HK $4.4 million; the present-day Hysan Development Company has a market capitalization in excess of HK $20 billion.
Split into simpler sentences: At the time of his death, his estate was valued at HK $4.4 million. The present-day Hysan Development Company has a market capitalization in excess of HK $20 billion.