Complex sentence: The only produce of Malacca was tin, from a river, and fired into tin block (konwn as Tin ingot) where each weigh 1.4 jin (Chinese weighing system).
Split into simpler sentences: The only produce of Malacca was tin, from a river. Tins obtained from river were fired into tin block (konwn as Tin ingot) where each weigh 1.4 jin (Chinese weighing system).