读句子的时候，不要一个词一个词地读，要读一个意群。

that引导定语从句，that多半为主语或宾语，你要往后找它的谓语动词。

 sensations of heat ....that （when resulting from sport or pleasurable exertion） are often accompanied by a glow of well-being

that引导定语从句，修饰sensations。that为主语，are accompanied by...为被动语态，括号内为插入到主语和谓语动词之间的时间状语。