114．Although leaders are often thought to be people with unusualpersonal ability．decades ofresearch have failed to produce consistent evidence that there is any categoryof “naturalleaders．”

(同位语从句evidence that…)

尽管领袖常被人认为是个人能力非比寻常的人，但是数十年的研究迄今未能提供一致的证据表明存在任何“天然领袖”类型。

分句1：Although leaders are often thoughtto be people with unusual personal ability

分句2：decades of research have failed toproduce consistent evidence

分句3：that there is any category of “natural leaders．”

1和2并列

2和3嵌套