However, there are people who are permanently plagued by a massive amount of self-doubt despite delivering a good performance.
然而,有些人尽管表现出色,却始终饱受大量自我怀疑的困扰。
该从句紧跟先行词 "people",没有逗号,用来限定“哪些人”。关系词 "who" 在从句中作主语,后面的谓语是 "are permanently plagued",因此属于限制性定语从句;句末的 "despite delivering a good performance" 是该从句中的让步介词短语。