Complex sentence: When international banking moved to Genoa, then Amsterdam, Lyon simply became the banking centre of France; its new Bourse (treasury), built in 1749, still resembled a public bazaar where accounts were settled in the open air.
Split into simpler sentences: When international banking moved to Genoa, then Amsterdam, Lyon remained the banking centre of France. The Bourse (treasury), built in 1749 resembled a public bazaar where accounts were settled in the open air.