An inflection point came at the end of Golden Week,when social media posts showing emptied shopping bags and snaking lines suggested that the state was cracking down on the practice known as daigou, when chinese travelers buy high end merchandise on trips abroad and sell the items at a profit .

第一个when从句为非限制性定语从句，修饰时间名词the end of Golden Week.

第二when从句为时间状语从句，修饰that从句的谓语was cracking down.

Spooked that the appetite for luxury goods could tip into a rapid slump ,investor jitters prompted a global market sell-off.

spooked为过去分词演变的表语形容词，that从句为修饰表语形容词spooled的状语（现代语法分析为表语形容词的补足语），表示原因。Spooked that...= Frightened that...= Afraid that...。Spooked +that从句合起来为原因状语，修饰谓语promped.