115．Furthermore，although it is commonly supposed that social groups have a singleleader，researchsuggests that there are typically two different leader ship roles that are heldby different individuals．

(复合句)

而且，尽管一般人认为社会团体只有一位领袖，但是研究表明通常存在由不同个体担任的两个不同的领导角色。

分句1：Furthermore，although it is commonly supposedthat social groups have a single leader

分句2：research suggests

分句3：that there are typically twodifferent leader ship roles that are held by different individuals．

1和2并列

2和3嵌套